Hi B&W
I would try to separate the issues.
Are there problems with breasts.
Is baby getting enough milk.
Is your daughter's anxiousness an issue in itself.
If your lovely grandson is continuing to gain weight, and is not crying with hunger non stop, then he probably is getting enough. If he seems to want to feed more than usual he could just be having a growth spurt. They can leave you pretty numb at that stage! Within a couple of days though, your dd's milk will have increased for demand again.
Are her breasts actually causing any pain on the lumpy areas or is it more uncomfortable? I know with my dd I used to massage them while feeding her. Think putting hand on outskirts and smoothing downwards firmly towards nipple. Sometimes they can get a bit lumpy while waiting to be drained! Kneading out the lumps can help. Hot bath or shower and the same actions will also help.
If it was mastitis I think she would be in a lot of pain and they tend to look a bit inflamed?? Was fortunate enough to escape that myself, but maybe someone else can help.
If you feel that your dd is more anxious than usual then, apart from saying that it is completely normal for mums to feel like this sometimes, I would definitely recommend her talking all concerns though with her HV who will hopefully pick up if your dd is not quite right and it is more than just the 'norm'.
Bfing is very demanding, very draining work! However much we as mums might enjoy it. It is still utterly exhausting sometimes. I think this is not helped by the on demand principle of bfing and fact that we can't measure what our babies have had so we don't get the reassurance that they've had enough.
This is where we have to trust nature that if baby isn't screaming with hunger, and continuing to grow then we are doing/giving enough.
If he is having a growth spurt he might seem less satisfied for a while but he needs to keep sucking to send the signals to increase supply. He will have more than he knows what to do with soon enough, if this is what is happening!
Mine used get lumpy/bumpy/ripples/lopsided
all sorts! Just have to keep massaging etc. I used to do it while dd feeding. Sometimes she couldn't keep up with the extra flow and would come up gasping for air, milk flying in all directions.
It really is hard to say without seeing first hand, but sounds like she may just be exhausted and worrying in a completely normal fashion. Some advice and reassurance from Dad (and Mum) bit of rest and I'm sure she'll be fine!