We are going though the same thing at the moment so i know how you feel.
She takes all her 8oz morning bottle no worries but then will only take 4-6ozs at lunch (totday she took 6.5ozs) then will fight with her night bottle. She use to take 8ozs at bed but lately will fight after 4ozs, i think some of this is due to teething. But i find her lunch bottle she getting smaller, i tired not giving her one at all for a few days but she has been really fussy with her lunch so i have given it to her again for a while.
Will she take any of her lunch bottle if you offer it to her?