my friend moved and hasnt gotten back to me

so I made a new friend in the first week of school and she was so nice and funny and we just bonded and clicked really well. she has had a ton of family troubles; she was in foster care with her older (half or step) sister and her boyfriend and even there she said sucked rly bad. they were rly toxic to her. her sister took her phone and then she found out like the next day that she'd be moving to a new foster home sometime next week. then the next day she said she'd be leaving that day instead. we had each other's phone numbers so I assumed she'd text me. its been a week and she hasnt responded yet. I assume her sister still has her phone because I tried finding and texting her snapchat account and still nothing. though, she did mention wanting to get a burner phone, so idk if she'd even be able to answer on snapchat if she did. if she got a burner phone, she probably doesnt remember my number. ik this probably sounds stupid because we barely even knew each other that long, but she was a really good and fun person and I really miss her and hope shes okay. not to mention I havent really made a friend in a long long time (and i dont have many left anyways), so our friendship felt really special. and I assume it was the same for her too, because she said she was hated by everyone at her old school (which is where she got moved back to unfortunately). I just wanted to get that off my chest :/