I’m a trans woman with male pattern baldness due to starting my transition much later than I’d have liked. I’ve managed to get some decent regrowth and it’s continuing.
I use the following: MTF HRT, finasteride, 5% OTC minoxidil, dermarolling twice a week (there are studies showing this is effective).
I can’t recommend this product yet because I haven’t started using it but I plan to start it in the next few weeks. It’s 8% minox. You could also probably just get a higher minox prescription right from her doctor. The only reason I know about this and will be trying it is because the doctor that has this formula created is well known in the trans community (he has a bit of a weird cult following tbh but people have told me online that this worked for them).
https://get.agelessrx.com/powers-hair-solution/
There’s also PRP injections in the scalp but that’s supposedly REALLY painful. The last resort is hair transplants that cost upwards of $10,000.