10 week old hard to get to sleep

Jenny
Baby is 10 weeks old and for the past 7 weeks we have been having an extremely hard time getting her to fall asleep. We discovered that if we bounce her on an exercise ball, she stays fairly calm until she falls asleep, but it takes 30-90 minutes for that to happen. At this point, she's only supposed to be awake for a little over an only total so sometimes she is awake for over two-three hours before she falls asleep. We tried rocking her and a swing. It is like this for naps and bedtime. 
Sometimes she will fall asleep for a few minutes, then is wide awake again. 
We have her in a dark room, we swaddle, white noise, she sucks on a finger because she won't take a pacifier. 
We try to watch for cues that she is getting tired. Usually she yawns, stares into space, starts getting kicky, and then finally starts getting fussy. We have tried putting her down when she first starts yawning and when she gets fussy and everywhere in between and it doesn't seem to matter. 
Any advice or does anyone else have this happen? My husband and i are hurting from bouncing so much and are desperate.