Thanks for the replies!
@Skadiver13:
Yes, I have been waking DD up early to feed her at 3 hours. This makes her naps 1 - 1:15. She would nap through without much fuss/needing to be shush patted. I thought so long as she's sleeping through the night with 1 - 1:15 nap times, things are fine. I remember reading from Tracy's book how some babies can get by with shorter naps...But these past couple of days she suddenly can't nap past 30 - 40 mins and now night wakings...

@Creations:
I might try to increase her EASY times to 3:30...so long as she doesn't wake up from her naps early! I used to Shush Pat her back to sleep when she woke up early but suddenly she's really fighting it. I've never seen this from her before.

I thought maybe she's hungry...but then she doesn't eat much. That's why I'm a bit confused...is she overtired? or does she need a longer E to A time? Will try your recommendation of longer E to A times only because she seems so happy during her 1:45 -2:00 Activity time. If it doesn't work, will go back to 3 hour EASY.