Totally.
This is something which does get prescribed to bio women as well as Post-OP Trans women.
She should discuss with her doc.
She would need a blood test to assess her T levels.
Then if T supplement were appropriate they could prescribe for her.
No idea as to product names nor dosages though.
Only her doc would answer that after the tests and possible underlying causes.
Don't tell her that a Tranny suggested this to you, though