It sounds to me like the reflux flaring up.
If she is not on medication for the reflux I would see a doctor about trying some to see if it helps. If she is on medication I'd have the dose checked, maybe she is heavier now and needs an increase.
Sucking is something LOs do to try to decrease the pain of reflux, it helps them to swallow as they try to keep the acid down. You could of course choose to give the paci if it is helping, but it sounds like the paci is not enough really.
Suddenly taking short naps can also be a sign of a reflux flare up, although they can get to sleep they either come awake quickly (5 - 10mins) with the acid coming up or are in discomfort in the light sleep phase so instead of transitioning to the next sleep cycle they fully wake to cry at 45 mins.
You can guess at all sorts of reasons and drive yourself crazy trying different routines hoping that different A times will fix something, but if it is reflux pain no amount of routine tweaking is going to help.