Babies will have short sleep/wake cycles all the time, Im sure she is awake during the day, maybe she is just a little less active, or you notice it more at night.
My little fetus is the same way, he moves around more at night then during the day, totally normal.
If you are really active in the daytime then your movement can actually rock your baby to sleep. My baby is always more active on the days when i sit around doing nothing.
Aww ok cool cuz boy she really moves alot n u cud see her body print thru my stomach dat be so amazin I just be like wow cnt believe another human n me growin big n healty