My furbaby is male, so his experience will be a little different in some ways but alike in others. Mainly in the fact that he kept jumping up on furniture and off of furniture. This is very dangerous because they could pop open a suture, or cause bleeding. Essentially during the day I just resigned myself to sit my butt on the couch all day holding him so he wouldn't accidentally hurt himself lol.
Periods of playfulness and lethargy are normal. Just like with a human after surgery, sometimes you feel okay so you get up and do stuff you really shouldnt and end up over tiring yourself. She may have a little diarrhea, if so feed her some bland food. I fed Shiloh some boiled chicken and plain rice. Shaking on and off is normal, it is one of the ways that dogs react to pain. If she starts shaking non-stop though you should prolly get her to a vet as there could be an underlying problem.
Keeping her isolated while you arent around is a good idea until her stitches have healed pretty good, I would say around 2-3 days(ish). Just remember that this is an estimate based on personal experience. When in doubt be safe and call the vet for advice
Hope that helps, and your lil girl starts feeling like her old self again soon!
Hugs!!