Id be careful about the topic.

Knowm is right. Perfectly normal and neccessary. She will tell if there is anything going on. If she says "this isnt a good time", Just go with that. I avoid intiating conversation to a woman about her body. If she wants to tell me something I let her bring it up.

Since you live far away from each other you might try planning a get together at an upscale spa/resort.

Surprise her with some activity you might enjoy doing together for the day.

Take a romantic bath together. Plan and bring supplies like a cool jazz cd, some wine and candles and insense if you can get away with it. Take a warm bath together,kill the lights, light some candles, play some music, drink some wine, Give her a long back rub and cover her in suds. Have some positive, playful conversation. Touch her all over real soft and let her relax. You can take it from there.

I guess what Im trying to say is find away around killing a mood and make her feel special instead.