Small boost hardtail frame suggestions please

My daughter is growing and I’ve been looking at sorting a new to her bike. I’m looking at second hand frames as I can’t afford a new one. Ideally would need to be a small 27.5 boost frame, but we’re open to anything and up to a full bike depending on price. In her words the purpler the better, although that’s not a necessity lol. Any help or suggestions would be appreciated.

Thanks

I think there was a small BFe frame on the cotic outlet the other day