Sounds strange, must have been Elly who dont want her there. Also since Alexa knows Amina wonder if she also knew Mary and Bridget a litte bit. These girls all seem to know each other one way or another.
Im sure Amina knows some of the girls she came with. You think she will be staying in B4 now? And what room? Maybe share bed with Mary untill Mila leaves and then get her room.