Hi there and welcome to BW
It is exhausting having a baby and a 2 yo, hopefully we can help you out here.
Would you mind posting your day so we can have an idea of her daytime sleep? And can you tell us what you do when she wakes at night? If the wakings are at all regular, can you also tell us that (ie are they always around 10, 2, etc etc).
Does she have any history of digestive issues? Reflux? And, finally, has this been going on for long?
My first thoughts for such frequent wakings are either cold (as you say), another discomfort, or overtiredness.
So, tell us more, and we'll try to help