Late hair fall on minoxidil?

Hi! I am a 39 year old female with recurrent TE. Dermatologist ran prelim blood and was clear. Trialed Nutrafol with initial results and then recurrent TE. On month 10 of topical minoxidil and following initial hair fall was having excellent results. Starting 3 months ago began shedding new growth (3-5 inch hairs only). Dermatologist wants to do biopsy because she doesn’t know what else to do. I feel like we are missing something. Hair is most sparse along hairline and temples, but only to me.