T.C.
I have an 8m also, (may 7) she just got 2 teeth on bottom, same thing (have 3kids, 2 1/2, 8yr) Just as I got her to sleep through the night, those teeth came, ans now she has to be with me to sleep!
I don't think I would give her that much water though at pm, just make it milk. For us, when we got up, I would rub Ora gel
give teething tablets or Ibuprofen (is best for inflammation)
and breastfeed, she was back out in no time.
Just remember, this age will pass soon,....soon they wont want anything (but money) to do with us!....this is what I say to my self!
Good Luck!