Its a snake.. noone really knows. My female does this too. Are you offering every 5 days or every 7 days? If it's either I would try every 10 days or so, but that's just me. Sometimes they just decide they aren't going to eat, and it's frusturating! And if she seems perfectly fine, nothing visibly noticeable I would just look at it as a ball python being a ball python. I had one little girl last night strike and coil, than just leave it there. My spider didn't even acknowledge the food, my mojave didn't even coil, just started eating it and my pastel took a small rat.. My bigger female is in blue right now, she never eats when it's shed time.

Now that's drama! hahah

Cheers.