In WOMEN, where is the testosterone located?

It is a hormone - it is not located anywhere. It is produced in her ovaries and adrenal glands. Women always have testosterone. Testosterone is what gives a women her drive - without it she has none. Women on the pill often have their levels suppressed (the side effect of the pill is not only can't you get pregnant - you don't want to have as often either - so less likely to get pregnant.)