The problem is that I do not know what her love language really is. I am guessing that I do speak her love language at times, but she is so assexual, she still does not respond in a way that I would notice.
Cemar, a couple things.
First, there are quizzes in the book-- to help figure out her LL. They are not perfect-- I actually have multiple LL rather than fit cleanly into one.
Now this second thing is REALLY important. You say above that you probably speak her LL some of the time, but you don't notice her reaction since she is so asexual.
The way you tell whether you are speaking her LL, is by her feeling more loved... NOT by her jumping your bones. You don't do her LL in order to have sex. You do her LL in order to show her that you love her. for example, acts of service = her feeling loved by you. You might secretly hope that when she feels loved by you, she will then love you and want to show her love to you by jumping your bones, but that's not the basic concept.
If you seem to her, to be obsessed with sex, but she does not feel LOVED by you... then she may conclude that you just want to have sex with her since she's handy, not because she's special, not even because it's her as a unique individual. It's like when you want to ML, it's usually to some particular person, because you have feelings for them in particular. (as opposed to a ONS or M, where you just want to get off).