I've been told that it is possible to coax her into having sex, but I've seen no evidence of this. I've offered her pretty significant sums and she's turned it down.
More to the point, usually when you have to offer somebody lots of cash who is unwilling, it doesn't turn out well. Nailea sees herself as a professional, highly skilled massage therapist, not a hooker, so she really wouldn't get into it. If they don't get into it, why would you bother?
Take her for what she is and don't offend her by asking to sleep with her.