Bottle feeding a breastfed babe

My baby is 2.5 months old and exclusively breastfed. Mmy husband and I had been giving her one bottle w breast milk a day to get her used to taking a one but she suddenly stopped. She's been smart and knows if she cries long enough she will get the boob lol. Anyone else going through this and know any tricks or tips? Seems we have tried everything and she just fusses.