Some of the smptoms you describe are characteristic of oversupply - bub gets a lot of higher-lactose milk, which he finds hard to digest. Feeding from one side for a couple of feeds until it is empty and then swapping usually deals with this. Sometimes the oversupply comes with the fire-hose let-down, which can frighten bubs - so hand-expressing until the splurting settles and then feeding can help there, as can feeding with her lying on her side and bub lying on a towel on his side, so the milk-gush doesn't "choke" him. Crucially for your sister, these two things settle themselves as bub gets bigger and supply self-regulates - probably in the next few weeks.
If it is "something in her diet", some of the more likely irritants are:
caffeine
cabbage/broccoli/etc
onions
It's not cows milk protein ('cause there's heaps of that in formula)
I actually suspect that the issue is positional/air-gulping/not liking to be horizontal when feeding. I would be really interested to see what the effect of an EBM bottle was!
There is also a small possibility that bub is simply hungry. To check this, offer a little formula bottle after a breastfeed and see if the result is a happier bub. If that is the case then the simplest answer is a day or two of very frequent feeding to up supply.
And: how to deflate a baby - bath (even at 4am if you have to), putting him on his tummy on your chest or tummy, bicycling legs, rubbing tummy in circular way, going outside (it may relax the baby - i always found it relaxed me!)...
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