It sounds to me like her cortisol levels are high, and this may be why the baby can’t relax and feed. Nobody should have to express all day, that’s ridiculous. I imagine that, although she doesn’t actually have visitors, apart from her mother and sister, she’s in a state of anxiety waiting for the gates to open to allow the audiences in!! It does seem unfair, and a long time to wait, but wait you have to. However long it takes, with no pressure. You DON’T NEED TO BOND. You did that with your own children. The relationship between grandchildren and grandparents is totally different, and can be taken up anytime. If you disagree with this, there’s still nothing you can do. Wait for the call, and embrace it when it comes.