S.C.
Hi R.,
I am still nursing my 9 month old son and he usually wakes up in the middle of the night for a feeding if he is too hot or too cold. Since they are rolling around a lot at this age and the blanket won't stay on, I usually put him to bed with a t-shirt and a light pair of pajama pants and little socks, no blanket. If it is a little cooler (which it hasn't been lately) I would just make the short sleeve t-shirt a long sleeve onesie or t-shirt. If it is warmer, I can just do the t-shirt, diaper and a pair of socks. I think my guy likes to have some socks on no matter what. :) Now if you notice sweating or irritability when she is sleeping, you may have too many clothes on her. But, my rule of thumb is, whatever I feel comfortable in, he is usually just as comfortable.
Hope this helps. :)