It is wrong to go into someone's room without permission.
Mary's hair is wet, and she just remembered that her roommate Anna most recently borrowed her hair dryer.
Mary wants to find her hair dryer.
Mary texts Anna to ask if she knows where the hair dryer is and Anna tells her to go get it off of her desk in her room.
Mary goes into Anna's room and searches for the hairdryer, which she finds on Anna's desk.
Anna is grateful that Mary asked her before searching all over the place for it and messing up her room.
Anna is upset that Mary went into her room without permission and this strains their relationship.