No.
It would be "A new computer was placed in her room," "A new computer was brought into her room," or some derivative.
You have entered the room.
"He entered the room" is the way the sentence should read
She entered the room
The correct pronoun would be "I": Lorna and I entered the room.To make this clearer, you would say "I entered the room." rather than "Me entered the room".The pronoun "I" is a subject pronoun. The subject of the sentence is "Lorna and I", a compound subject.The pronoun "me" is an object pronoun, a word used as the object of a verb or a preposition.Example: The door opened for Lorna and me. (the compound object of the preposition 'for')
Subject, "they", verb, "entered", direct object, "room", (and "the" is an adjective of room). So subject verb direct object.
The light was dim when I entered the room.
A veiled woman entered the room.
The king entered the room with expected pomp and ceremony.
I entered the room stealthily, hoping to remain unnoticed.
When Max entered the room, Freddie abruptly turned and walked out.
Yes, the sentence "The children were moved forward to the next room" is grammatically correct. It conveys that the children were relocated or advanced to the next room.
The sentence is almost correct. It should be "A copy of Moby Dick and several magazines have disappeared from my room" to ensure subject-verb agreement.