Dd is 9. One of her friendship group from school has been quite nasty to her online and via text during lockdown. Pressurising dd to give her her pets on Roblox, texting her and calling her a bitch when dd refused, threatening her saying her mum was going to batter her if she didnt do as she asked. After this they stopped communicating however dd sent a little text a few weeks later saying its friendship day shall we just be friends again and got a one word NO in reply. Its dds birthday next week and I'm just having a few girls over to play in the garden. This girl has found about about this and has now started texting dd asking if she can come and saying they can be friends again. Dd is a bit conflicted, she thinks she only wants to be her friend because of the party but hasnt got a nasty bone in her body and I think her default would be to just let her come. This girl is trying to video call her all the time for an invite. MIL thinks that all young girls have fallings out like this and I should just invite her. AIBU to not want this girl in my house after i saw how upset she made my dd. I dont know whether I'm just being over protective.