Hair straightener for 16-year old girl

I need your help! My 16-year old daughter needs a hair straightener. I know such tools can be harmful to hair, but she cannot manage it without straightener! She used my flat iron couple of times without my permission. Are there any appropriate products for such kids?

She has wavy natural brown hair and it's really strong

MrsJohnson said:
She has wavy natural brown hair and it's really strong

Sorry for such late response, but I think I can help you. You said she has a strong hair, I would say that knowing your hair texture is crucial when choosing hair care products and as far as I know there's a variety of flat irons specifically designed for thick hair. Here check this page for comparison.