I've just been through this with Bella (3 1/2 months). Has taken 3 weeks to sort .... having been through rice/chicken/scrambled egg diet and slowly reintroducing her usual kibble only to return to splodges she is now on a sensitive stomach diet and is doing much better. She did start with a 24 hour fast but really your vet would be the one to say if that is OK for your pup or not.

Hope overnight went ok - Bella only had one splodge in the house when she was at her worst but although she has a crate we have always left the door open overnight.

Anyway, hope she gets better soon