What would be the best setup to ease my niece (10) into tux land?

Watched my niece yesterday and while we were playing Minecraft she noticed that my laptop "windows n stuff" didn't look lik the schools computers and I told her about linux and she got rly interested and now she wants a laptop "just lik mine" which is runnin Linux Mint

She's somewhat technical apt, for a 10 year old, and I could probs dig up a decent laptop for her but not sure if I should jus dump mint on a laptop for her and let her have at it or something else?