Any chance she is taking hormonal birth control, such as the BC pill, Depo-provera shot, etc? They can kill the libido - not only from possible weight gain, but the extra hormones in these can upset a woman's natural hormone balance.
Even though testosterone is the main libido hormone for men and women, women need sufficient levels of estrogen for testosterone to be absorbed (providing her testo levels are sufficient). Estrogen is important for other sexual functions such as lubrication. Has she had her hormone levels tested?
Even though testosterone is the main libido hormone for men and women, women need sufficient levels of estrogen for testosterone to be absorbed (providing her testo levels are sufficient). Estrogen is important for other sexual functions such as lubrication. Has she had her hormone levels tested?