Discovering the Eucharist in the Old Testament
Let's begin with the seance. To conduct a seance as a means of conjuring information from the other side is a big no no. The theological term is divination. The catechism explicitly denounces any form of divinization as a violation against the first commandment and a dangerous flirtation with the opening of unknown doors that may let some evil spirit through. All forms of divination are to be rejected: recourse to Satan or demons, conjuring up the dead or other practices falsely supposed to "unveil" the future. The information gained from evil spirits through a seance is prone to either intentional deception or erroneous and flawed human error or misinterpretation.
To conclude that the doll was possessed by a human soul of a young girl is problematic. Spirits can attach themselves to objects but they do not possess objects. Human spirits most likely would not be permitted to attach to an object as to make it 'cursed'. God permits evil spirits (to be exact, demons) to tempt, harass, infest, obsess and possess. So this begs the question; did little Annabelle become a demon after death? The human soul, after death, remains a human soul. It does not become an angel or a fallen angel.
Human souls or ‘ghosts’ may be permitted to contact the living with God’s permission in a coincidence, a dream or in some other way usually as a type of consolation for the surviving relatives. But there is nothing in Catholic theology that would suggest that a human soul of a six year old girl would possess a doll or attach itself to any object.* Was the soul of Annabelle lost or stuck in this world? After death the human soul is not lost. It faces Jesus Christ for immediate judgement and then is either in purgatory, hell or heaven.
It's more likely that the doll Annabelle is an example of demonic infestation. In Catholic demonology, infestation refers to the presence of demonic activity in a particular place or object. A demon may be permitted to attach itself in some way to an inanimate object such as a doll. Though it might be manipulated externally, the doll is not actually possessed. The word we would use is cursed. The demon may deceive people into believing that the doll is possessed.
Only people can be demonically possessed. “A curse is simply a demon sent to do some harm. . . . Cursed objects are objects that have had the opposite of a blessing done to them. Instead of grace being attached to an object to make it holy, a demon has been attached to the object to make it associated with evil.” (Hauntings, Possessions and Exorcisms, p. 45).
The statement above seems to equate priests with ordinary people. If the priest is a trained exorcist with the sacrament of Holy Orders from the Catholic Church, he would be able to overcome a demon through the rite of exorcism. However, he would be the first to say that he is merely an instrument that God employs and empowers. Certain Catholic priests have been given this power through their bishop because their bishop received the fullness of the priesthood by virtue of apostolic succession. Only the apostles were given the power to drive out demons from Jesus himself as recorded in scripture. So a Catholic exorcist is not just an ordinary guy. In fact, in many cases, after other clergy from other Christian groups have failed in dealing with demonic infestation or possession, usually it is then that a Catholic priest is brought in to carry out an efficacious rite.
It's true that a demon may be permitted to physically attack a person. There have even been cases where Catholic priests have been physically attacked. They may have made a mistake in preparation or were in some way sloppy with their words and actions during a session and as a result they opened the door to a physical attack.
A physical attack by a demon is called demonic vexation. According to Dominion by Fr. Chad Ripperger, “Vexations are true and actual aggressions, physical or psychological attacks that the demon works against the person.” There have been cases involving bruising and lacerations especially in the lives of the saints. The demon is permitted to engage in a physical attack to increase the virtue and holiness of the saint. For example, Saint Padre Pio had many such encounters with a demon(s).
The catechism describes the power and purpose of demonic vexation. “The power of Satan is, nonetheless, not infinite. He is only a creature, powerful from the fact that he is pure spirit, but still a creature. He cannot prevent the building up of God’s reign. Although Satan may act in the world out of hatred for God and his kingdom in Christ Jesus, and although his action may cause grave injuries – of a spiritual nature and, indirectly, even of a physical nature- to each man and to society, the action is permitted by divine providence which with strength and gentleness guides human and cosmic history. It is a great mystery that providence should permit diabolical activity, but “we know that in everything God works for good with those who love him.” -CCC 395