S.M.
Hi A.,
My son cut 2 teeth at that age. I wasn't expecting it at all, but his behavior definitely changed. He cried a little more at night, and at night he would cry out then fall asleep.
According to my reading daytime napping has nothing to do with night sleep- at all.
I would not stimulate her at night when she wakes. I found that picking up my son at night woke him up out of a lighter sleep. As if I was over soothing him. I have to let him toss and turn, and he is learning to fall back asleep by himself (it is difficult for me though!). It wakes me because he sleeps with us, but I find that easier to bf. I am reading Healthy Sleep Habits Healthy Baby by the recommendation of mommies on this site. I would recommend it, it has enlightened me to some bad habits I had, although I don't think I will follow everything in the book right now.
Good luck and don't worry.