Nipple/Breast confusion

I need some help in regards to nipple confusion.

So my daughter is 7 weeks old. We never had any problems breastfeeding, she was perfect at it. She would have a bottle here and there of either expressed milk or formula but that was never routinely given or often enough to cause the problem.

Skip to two weeks ago, my grandmother stayed up to help me and went against my wishes and didn’t wake me to breast feed her through the night, just kept bottle feeding with formula. Literally the next day when I woke up leaking everywhere, I tried to feed my girl and she wouldn’t latch long enough for me to empty boob without screaming. Once she was given the bottle, no dramas. Next night this occurred again, and I told her that if she was going to stay and help she had to bring the baby in to me.

We are now 2 weeks later and my babe refuses breast. I have lost so much of my supply because of it. I try pumping and very minimal comes out (I used to be able to pump anywhere between 60-90mls per boob even after feeds), and if I somehow do manage to get her to latch on, it’s only for 2-3 minutes and it’s hell during those minutes until she gets her bottle.

What used to be one of my favourite things has become a nightmare and is causing me more stress.

Has anyone experienced this? The only bottle she will take is Dr Brown, I tried to switch to nuk as it’s more nipple shaped and she wouldn’t take it, just choked and screamed even with slow flow teats.

I’m literally at my wits end, I just want to breastfeed my baby and bond again but just don’t know how to reverse this when it shouldn’t have ever happened in the first place 😞 I just feel so resentful towards my family for this happening as if my grandmother hadn’t have stayed this never would have happened