9 Week old baby refusing to take bottle

So my daughter is 9 weeks old has been exclusively breastfed since she was born. I need to go back to work soon and I've tried tons of different bottles (Tommee Tippee, ComoTomo, Mam, etc.) but she won't take any of them. She gags the second it goes in her mouth. Does anyone have any tips on how to get a baby to take a bottle.