Okay, so here's the thing: A person whom purposely touches what is deemed as a sexual area and comments "sexually" about said area is considered someone who's making a sexual advance. This is sexual harassment and I'd be very surprised if she herself did not mean this to be a sexual advance. People who do this sort of thing generally either don't see the wrong in doing so because they themselves are mentally ill, or they do see the wrong and are manipulative enough to either make you see otherwise or make others see differently. They either want to seem innocent or actually believe they are.
If you haven't already told your parents about this, you need to. Make it clear how uncomfortable it made you feel. If it has happened more than once, that makes telling your parents just that much more urgent, especially if you see this person regularly. From personal experience, it never ended with just a simple "misunderstanding". It ended a lot worse and has me so messed up now that my PTSD has landed me in the hospital twice and sent me through a special kind of mental hell.
What this woman has done isn't right and women are just as dangerous as men in this area. Perhaps worse, due to the fact that this is much less suspecting and more likely to work with children. They're women, right? They could never hurt a child. Bull****. You don't make someone, adult or child, this uncomfortable. Ever.