I went to add the name TheOnlyJulia to the whitelist but I was unable to, usually this means you've given us the wrong username or you're trying to connect with the wrong version of the game. We run Java edition therefore any other versions such as Bedrock will not work.
In regards to being sent an invite to play by someone, since your daughter hasn't been on the server it's unlikely it was from anyone here, and I'd advise you to be weary of it. As is sometimes the case with internet gaming not everyone has the best intentions, but this is unavoidable and common sense about this sort of thing should prevail (i.e. you wouldn't get into a strangers car, therefore I wouldn't accept a random invite by someone I know nothing about).
Hope this helps, if you have any further questions give me a shout!
Hello, Bonjour, Hola, Hallo, Hej, こんにちは, مرحبا, 你好, Selamat pagi, 안녕하세요, ສະບາຍດີ, สวัสดีครับ, Xin chào.