Randi, you and Effy have had quite a day! I hope you both get some sleep soon. For ketones, you need to help her be as hydrated as possible, so it's good that they gave her fluids at the vet. In addition, mix in at least 2T for each can of FF you give her, and if she'll accept it with even more water than that, go for it! The more she gets the better.
Fortiflora is an amazing flavor enhancer for cats. Many cats will eat anything if you sprinkle some of that on top first. You may want to break up each can of Fancy Feast into smaller meals/snacks and help her to pace herself. Since the fortiflora makes it so enticing, sometimes they will overeat which isn't good for a kitty who has been nauseous. Going forward, you might consider using s. boulardii as the probiotic since fortiflora isn't really that effective and has some questionable ingredients. I use it just to make the food taste better when one of my kitties doesn't want to eat, so one packet will last like a week - I just sprinkle a tiny bit on top. Then I use the s. boulardii to keep his intestines happy. It's more effective in that regard. Don't worry about that now, just something to consider in the future.
Metronidazole is amazing. For my cat it tends to work fairly quickly. A day or two and he's back to normal. It's important to give all of the doses, just like any antibiotic, even if Effy is feeling all better. It does have a horrible taste, so if you can wrap it in a teeny bit of a pill pocket, some cheese, etc. to help get it down without her having to taste it, that will help. Is she easy to pill? Let us know if you need any hints on doing that.
It's so good you got the ketone sticks. Hopefully she'll make it easy for you to get the tests done so you can keep an eye on things. Make sure to check it at the right amount of time and in bright light. If you let it sit too long the results won't be accurate. The timing is really important on those.
Finally, looking at your spreadsheet, I think she needs some dosing adjustments both to keep the ketones at bay, and also because high BG can make belly issues worse. Which insulin are you using? We have groups for each type of insulin, and if you post in one of those groups, the folks who know your insulin will be more than happy to help guide you to adjust the dose and hopefully get Effy into some better numbers.
I know that's a lot, and you've already been through a ton today, so please get some rest and just snuggle with your kitty and take care of yourself. We are here when you have questions!
