Can you explain more about what you think is different with her?

Something similar happened with my T and it was very confusing and painful. It was hard to know if it is me or him and It was difficult to even put what it was into words. All I knew was that there WAS something happening. If your T is pulling away she may be doing so consciously or unconsciously. Be prepared for her to deny that she is doing so and willing to explore it further if you feel that's what is happening. Trust your feelings!