I could be very wrong here but it sounds like it was the birthday girl being nasty, I can understand the mum staying in her room to give the girls time on there own . I also would have thought that takeaway pizza would be a real treat for them unless the you have it regularly at home, then it’s not such a treat. Also I imagine that they had no particular activities because that’s what they wanted. To be fair on the mum she arranged it so her daughters head was next to your daughters. In my honest opinion, it does sound like the birthday girl didn’t want her there and possibly said your daughter could come but couldn’t sleep with them in the bedroom. Your daughter wasn’t treated very nicely by these girls , however, she did say that the other girls were nice. I think she only said it was boring because she was left out and she wanted to make it sound that she wasn’t having bothered about being included