It all comes down to the absolute refusal to study the female body, test products and medications on females, and give women medical care instead of diagnosing everything as "anxiety" and throwing chemical castration at it.
Your daughter just got her first period.
Do not tell her she is a woman now.
Tell her what estrogen does.
Tell her what progesterone does.
Tell her her cycle has four phases and each one will feel different.
Give her information. Not a new identity.