I think that it can take up to 10 days for some gastro viruses to work their way through little bodies. I know that my DS2 has vomitted sporadically over 4-5 days with each bout of gastro that he's had, and the nappies...OMG, the nappies......

If your bubs is still having relatively normal amounts of breastfeeds, some wet nappies, sleeping ok, doesn't have nasty temperatures, and appears to be mostly fine & happy in between the occasional bouts of vomitting, then she's probably ok, her little body is just taking a bit longer to fight the bugs than a more mature body would take. Even if she's bringing up all the BM, try not to let that stress you, the BM will still be helping her tummy.

And keep washing your hands