How old is your baby now?
And if your baby was having trouble latching on earlier, how is it different now? Is she NOW able to nurse properly? How do you know?
Even if you would like her to breastfeed...if she is rejecting breast for whatever reason, you MUST feed her by any means that she will feed. Otherwise she will starve. Otherwise you'd be withholding feedings in order to "see" if she takes breast...meanwhile, if she can or cannot adjust to the change... she will still go hungry.
Many Moms for various reasons must supplement... in your case, is was because she was not latching on, and bottles were more appropriate for her. Main thing is she gets intake....proper amounts, and fed ON DEMAND no matter how often.
Next, did you see a Lactation Consultant? Did you get advice from your Pediatrician? How is your baby gaining weight? Is she growing/gaining weight appropriately?
If you want your baby to get on "100%" breastmilk and she will not suckle from direct breast... then you'll need to pump frequently and feed her breastmilk from a bottle....since she DOES take bottles. OR, You can gradually mix breastmilk and formula...transitioning a little at a time...perhaps mixing a little breast with formula in varying ratios, until the quantity is 100% breastmilk. Lots of Moms mix breast and formula together.
IN EITHER CASE... you must (1) make sure she is getting intake (2) that she IS able to nurse/latch on/suckle properly (3) that she IS able to switch to only breast...since that is what you are hoping. (4) make sure that if she continues to reject breast that you just use bottle. THIS is her way of "telling" you how she needs to feed. Not all babies can breastfeed/latch on/suckle productively, like we would hope. So, you must do what is best for your baby. And let her lead you.
IF NOT... and you keep expecting her to nurse from the breast and she cannot or rejects it... you will be frustrating her, and she will not be getting proper intake/nutrition. So, you must continue to feed her via bottle...
You have to make sure she is getting proper intake, daily.
All the best,
Susan