You're doing great Leasha - I wouldn't be doing anything differently. It's great she is keeping the boobies down. Poor bottom - zinc on it maybe?

Paedalite/gastrolyte etc are electrolyte drinks. I personally (that's my personal opinion!) think that they are unnecessary if a baby is breastfeeding. Breastmilk is the best fluid for a sick bubba. If the child is vomiting and pooing enough that they are not keeping breastmilk down for an extended time 6 hours or so then they probably need to be on an IV and wouldn't keep the paedalyte down anyway... That's my experience. Also it doesn't taste like anything that Jazz would have probably tasted so she wouldn't want to drink it!
They are helpful though for older kids/adults who can tolerate sips. Having said all of that water is wonderful!

I hope she continues to improve over the day. Keep an eye on that temp (she will get lethargic with a high temp) & personally I would give her some panadol for comfort & to keep the temp down... The high temp can make their muscles sore and head ache - pretty awful...