D.W.
Florida has been hit very hard with a GI bug. Everyone I know has had it! And yes it does keep the system upset for quite a while. Our niece got fed "real" food too soon and just kept throwing up because it kept irritating the system and ended up having to get an upper GI (that was fine of course they just needed to stop feeding her spaghetti-O's-duh!). Like B said, keep her on the BRAT diet and add yogurt too. I see you are using probiotics but adding the yogurt too will also give her something else to eat and you already know it will help get her gut back on track.
And be aware that she will still be highly contagious for 3 days after the symptoms end and she can still shed cells from the virus for up to 2 weeks after (taken from the CDC website). It's a terrible bug. Sounds like you guys got lucky with a milder case!