There's the joke about telling the doctor, "It hurts when I do This" and he replies, "Then don't do That!" You probably do want to, not quite desensitize yourself, but work at not bothering with her past; kind of like the dermatologist I went to when I had an itchy callus above my eyebrow and he did tests and found it was none of a million possible weird African diseases or anything so I said, "Well, can you give me a cream or something so it won't be itchy" and he said, "No, you have to teach yourself not to touch your face/scratch it." Things work both ways; you know her past bothers you so I would train myself not bother it unless you want to be bothered :-)