A.,
Teething is miserable--for the child and for those of us who get to watch the misery. I agree with giving Tylenol (if that is still OK to do--my son is 6 and these things change every year!) Also, you might consider propping the head of her crib up on phonebooks to help relieve her congestion a little. I'd probably continue to do what your doing--if the extra bottle seems to calm her to sleep, then do it. You may, however, have to "un-do" this once the teeth break through. BUt I say--go with what works when a kid is sick/uncomfortable.
O. other thing I did was to take about 6-8 baby washcloths, wet them, fold into quarters and freeze in a stack in a Ziplock bag. Give her O. to munch on & it helped my son. Also, have you tried the Hyland's teething tablets? I didn't know about them when my son was teething, but I have several friends who swear by them. They dissolve instantly on the tongue and are all natural. Hang in there & good luck!