DSD2 is 15 and has anorexia and other mental health issues. While she was having inpatient treatment last year we let DSD1 who is 17 invite her girlfriend to stay for a week
We didn't tell DSD2 as she was really ill and we didnt think it was something she needed to know or worry about but DSD1 told her in an arguement even though she was asked not to. She was really upset that someone had been in our house without her knowing and felt that we enjoyed having her instead because shes a 'normal teenage girl'.
DSD2 has now decided she hates DSD1's girlfriend and that she isnt allowed to come back here again. DSD1 has promised that DSD2 won't have to interact with her and that she will make sure they keep out of her way but DSD2 still doesnt want her here. She doesnt like intereacting with many people anyway but we all have other guests round regularly which she doesnt mind as long as she doesnt have to talk to them.
Who is being unreasonable?