At her age, I'd call the vet FIRST thing in the a.m. and get her back in. Are her gums nice and pink? Is she drinking water and eating? I would get some canned pumpkin at the store and give her some asap.
A 9wk old can go down FAST, so please get her to the vet soon. It doesn't mean anything that she is acting fine - they can act fine one minute, and the next be in an emergent state (at this age).
Glad you found this board bc there is a lot of support here - so WELCOME!