That she is a woman.
She has a healthy head of hair but never wants to have sex.
If her testosterone level is too low she'll lose all her sex drive, she needs to get to a doc and get her hormones tested, that's the easiest way to see what's going on.
Well since testosterone is mostly a male hormone, MOST women should have very low levels of it. If a woman has too much testosterone she tends to be hairy in all the wrong places and occasionally even speaks with a lower voice. This is based on my experience, mate, but eveyone is into different things.