Yeah but for girls/women -- it's different -- we think with our emotions 99+% of the time -- even with sex -- there is always some emotional tie. So if she's masturbating to an ex -- there's some emotional attachment, trust me. As far as a man I'm with --- if I found out he was masturbating to an ex, I don't think I could deal with that bullshit in my life, I'd probably end things.
As a woman. I agree with this whole statement. You asked and you received...based just on this there is nothing to worry about. If there are other problems then this could be related...but frankly, stop asking, tell her you don't really want to know, and get over it. She might be telling you because she thinks it is sexy to share personal fantasies, not to offend you. As long as you know this, you might be able to find other ways to make a similar impact. Also, as for the emotional...there are emotions related to the physical sensations of sex, she could very well be thinking of how it made her feel...but women can fantasize about the physical aspects as well. I know I can.