She's not eating- but does she have diarrah or vomiting as well?
Could be a major problem if so-or again not-
If's she's like my ex's dog-she ate everything and would be sick for days-till everything passed.
The best thing to do in that case was no solids for 24 hours then start slow with boiled chicken and plain white rice.(and most dogs won't turn their nose up to fresh chicken) Then slowly start her on her food again, by mixing small parts into the rice/chicken mix. This became such a regular thing-we almost decided to cook for her all the time!!
But keep an eye on her-could be something she ate.
But make sure she is drinking water and if she doesn't start eating by tomorrow, call the vet. Sometimes, dogs know, and they don't eat when they don't feel well, but start eating when their belly feels better, so it may be nothing major.