what can I do to stop others being scammed by her

Very little.

She probably isn't real, the account is almost-certainly fake. That isn't her photo it is probably a stock photo or stolen from a web-page somewhere. The scammer might not be a woman.

Just as you probably didn't look at this independent website (bitcoin.stackexchange.com) before "investing" in bitcoin mining, so other future victims are likely to walk into this without really looking around and educating themselves about "bitcoin mining".

Maybe you could get your local news media to write a story about your experience. That might save one or two people from losing money.

This website already has many stories similar to yours.