It's the first mountain bike for my daughter and in the end I decided to buy a relatively cheap entry mountain bike. It's gonna be heavy but I can buy something better if she likes mtb next year. I'll convert the cheap bike to 1x and also upgrade the boat anchor fork with a used reba.

My bad, I meant 4' 10".

Maybe I'm looking for a unicorn but do you guys know of any 27.5 XS boost hardtail frame from a reliable brand? It's for my 5'10" 4'10" daughter and I can get cheap boost wheels, hence this requirement. It seems that most frames I find are non-boost.