Most Helpful Girl
I actually have a good friend who got her husband's astrology sign tattooed on her ring finger because she can't wear jewelry at her work and she has a lot of allergies to the metals that are placed in jewelry.
I'm assuming that it is on her Left hand ring finger.So, yes there is a good possibility that this woman is married or was married at one time (personally I would try to get it removed, but to each's own).
Right hand ring finger could be a symbolism for something else. Kind of like a promise ring in the form of a tattoo.