can you get to the maternity ward easily? Just thinking you need to see the infant feeding specialist/lactation consultant asap. Was she checked for tongue tie? Evie had trouble holding onto the nipple iyswim and took agaes to feed she had a slight tt that as soon as it was snipped chanhged the way she fed. Maybe try to feed her before she gets really hungry if that makes sense. Even give her some expressed and get your let down going and try to latch her on then, it can be a bit messy but it may work.
Spend time lying down in bed maybe with her on your tummy so she can bob on if she needs to.
Call the midwives tomorrow, even if that means calling the ward and push push push to get onto someone. It really does make all the difference.
Keep trying you are doing a great job xxxx