Investing as a 21yo

So my step daughter is going to be coming into $250k very soon. She asked me for advice on what to do with the money.

If I were in her position, I'd wait for the next drop and shove a minimum 100k into BTC. And the rest can be split between a high interest account and a living account. But I need to be careful I'm not the reason she loses money if anything strange happens in the next four years.

Real estate is way too expensive around here to invest in that. Plus no bank would give her a loan being an apprentice jockey.

I said that I'd probably invest 50k into BTC and that I'd think about the rest and get back to her.

What would you do?