Yep, gastroenteritis=stomach bug. She'll be feeling great in no time. Just make sure you slowly transition away from the ID. With Zoe, we usually try to do 2-3 days of ID (giving her a couple of days once she's back to normal eating and poos) then start adding back one meal of kibble a day until all 3 meals are kibble with normal poos.
Another word of caution: ID plugs Zoe up (I think it's the rice). So your pup may not go poop much or very regularly. I think Zoe once went like 36 hours after going on ID before she pooped (because we were adding it back in small amounts and it doesn't go through the system so fast like normal kibble). The vet said this is normal (actually, its' why ID helps with diarrhea!

), but I thought I'd warn you in case it happens to you. I know I start getting really nervous that maybe she DID have a blockage and I'm anxiously awaiting that poo, but sometimes it takes awhile to come. Good luck!