maybe the routine your trying to get her in no longer works? and it needs to be changed as babies change all the time....
why wont you let her on her tummy? she is very active(obviously) it might be where she wants to sleep and her crawling around the cot might be looking for the best spot? i know i never stay in the one spot over night

will she sleep next to you if you lie down with her? then maybe move her to her own bed?
if you let her play and play would she just go to sleep on the floor? does she have to sleep in her bed atm?
just trying to think of ways just to get her to sleep then you too can rest and come up with some ideas that might work?