we all had this a few weeks ago too. charli got it first, no signs she was sick, just woke up one morning in a pile of vomit
i didn't think anything of it because she ate her brekkie and was running around as normal.
next morning was the same
she only seemed to vomit during the night and was fine during the day
this lasted 5days...........then i got it and had it for almost 2wks, jack got it for 3 days and DH didn't get it at all
just keep her fluids up, small amounts often. hope she's over it soon