Hmmm... That's too bad. Which model does she have?
I was considering a used 2020 i5 MBA for my young kid since performance is not a big concern, just OS support. Usage would be surfing, online interactive websites, Zoom, Messages, and simple stuff like that. (We have older less powerful Macs which handle that workload just fine.) M1 is a consideration too, but the M1 MacBook Airs are considerably more expensive. The (much) longer battery life of M1 would be a bonus, but isn't mission critical as it will be mainly used at home.