I wouldn't worry about the 1 hr nap too much if it's only been a day or a few days. Especially in light of the night wakings - it completely sounds like your dd is having a problem that is disturbing her sleep - teeth, cold, temperature sensitivity (recently my dd has been waking around 4:30, and I think she might be cold...). I wouldn't panic yet, just go with the flow and try to make sure you keep all her routines and cues on track.
My only worry would be if you think she's lost the ability to resettle herself. If that's the case, I would work to get her back on track going to sleep on her own.
Otherwise, try to help her with teething, etc. so that she can sleep better!