Sounds like she is more comfortable and physically ready when she decides she’s aroused. I wouldn’t take it personally unless she blatantly tells you that you are not turning her on. If she replied during her offense with the two moves/porn star thing you should look into some kinks and turning her on with things she’s maybe not yet experienced and might want to. Or perhaps just find new ways to turn her on - be creative. The fact that you can predict the sexual interaction says a lot about your sexual relationship with each other and that being said you both have an equal opportunity and obligation (not exactly) to keep each other interested. Sexual aspects are very important although not the only important thing. If you guys are good together outside of sex - just start getting freaky.