I think the same as BF poos. Poo should be pretty runny til they're on solids, I think.
Maybe look at her behaviour re. settling at night? Does she seem like she's in pain, or is she just getting overtired? When Natty was little she used to take HOURS to settle down in the evening (between about 5 and 9pm - she'd usually drop off, from exhaustion I suspect, by 10). Does she sleep during the day? Sometimes it can all build up and they can't relax. If she seems like she's in pain, she may benefit from seeing an osteopath specialising in babies who can check her out physically. I'd be hesitant to just say 'reflux' automatically, as chucking up is a pretty normal part of being a baby. The pain isn't, obviously, but before I'd medicate I'd be looking at all the options, KWIM?
Anyway, I wish them all the best and hope they can find a solution soon.