2 month old refusing bottle

My daughter was doing fine taking one bottle a day then after several days of me just nursing with no bottles she is flat out refusing one. When I put it in her mouth she cries like I'm doing something mean. I have to go back to work in less than a month and I'm determined to get her to take one. How long is appropriate for me to allow her to go without eating if she refuses the bottle? I'm trying not to give her a choice