I struggled with my supply early on which resulted in my baby becoming dehydrated and was eventually put on bottle formula
Anyway, now my milk has come in and I'm beginning to express as much as possible now.
However she won't take my breast anymore. She developed a good latch when she was 2 days but after being so hungry and then finding the girls... Now if i present her with it she starts to really cry as if completely upset. 
If like to encourage her back to breast fur the majority of feeds. But not sure how.
I do skin to skin +need to do more,) and offset it to her without trying to pressurise but... She just didn't want to any more.
She's 6 days old today.