I would say if she is happy when she wakes up, that maybe 50 minutes is all she needs. It's probably throwing off the three hour schedule because she's isn't able to stay awake for 2 hours, but maybe she needs a 2.5 hour schedule for now. If she's crabby when she wakes, maybe try pat/shh to get her back to sleep for a bit longer. I'm not sure about W2S- I haven't tried that before. Good luck!