It really depends. I would say some women (for example me) have a low sex drive and therefore masturbating too often and too much would make them uninterested in sex. If she is focusing on the clitoris, even more so, as prolonged and/or intense stimulation to the clitoris tends to make it less sensitive, numb or even…

Don't be embarrassed, everyone's different and there's no shame in what you do or don't do in the bedroom - but it might just be that you haven't found what works for you yet. If you're still interested it might be worth trying some different things out. Try toys, stories that indulge your fantasies, different…