Learning Curve
Master Don Juan
This yes.She wants an LTR with you and needs to test if she can manipulate you sex-wise.
Hope that solves your confusion.
But, you have to test this theory.
Make a move for sex that is clear and shows you want to have sex.
If she stops you, and she just says "no" you can open the conversation there and ask what's going on.
99% percent of the time she will tell you, either what @AmsterdamAssassin said, which it will be in the lines of "what are we?" "where is this going?" typical stuff that happens all the time like a predictable hollywood blockbuster movie.
Don't ask for a relationship, let her bring it up. And just go along with it. Let her be her idea, not yours. Don't force it, even if you like the chick.