Yep, this very well might be IBD. I have a pup with lymphangectasia and IBD and she is on home cooked diet of tilapia and sweet potatoes.
If GiGi won't eat that kibble, and you might be interested in home cooking, this website has free recipes .. of course you need to purchase the supplement but it is not that costly.
www.balanceit.com
Hopefully she will love the kibble and have no further issues.