First: Stay Calm! Two days is not that long. As others have said, she had major surgery, which can have all kinds of side effects. I've had surgeries before where I didn't eat for days, either (and I kept all my limbs after all of them, too :p). Plus, she's a cat. Cats can be...difficult. The fact that she's going potty is a good thing (don't trust her purring--cats purr when distressed, as well. OTOH, if she's not hiding or displaying avoidance behavior that's good )

Anyway...all of my cats have four legs...but I do have experience with hunger-striking animals :p Our tripawd dog Sampson was notoriously picky, and one of our cats, Momo, is in renal failure, and last year after he came home form a long hospital stay during a crash, he had lost half his body weight and wouldn't eat ANYTHING (and when he's feeling bad, he will strike again).

Some things to try:

(Low-sodium) canned tuna, smooshed up finely. You might even just start with tuna water/juice (or even just pouring some of that on a little kibble).

As other have said, baby food. The hot dog or ham (or other meat flavoured) kind. You may have to thin it even more and let him drink it (also helps with constipation).

The absolute go-to food in our house when all else fails: Fancy Feast Classic (pate)...again, you may need to thin with water.

You can also mix the tuna water in with any of those.

Some more doggy ideas (but could be adapted): boiled hamburger or green tripe (I use Tripett) smashed up and liquidy (or just smashed up--some cats are weird about textures)

Some cats/dogs will eat Nurtical (a food supplement in a gel/paste form). none of mine will that I know of (well, at least not the sick ones. The fat healthy ones will pack it away, given the chance )

Basically, find something horrid and smelly. None of those things will be a "lifelong food" source, but the trick is just getting her to eat SOMETHING. As the old saying goes, eating tuna/fancy feast/hot dogs every day for a few weeks might not kill you...but not eating anything at all definitely will. Get teh routine of eating going again, even if it's just a tiny bit, and that is often all the help they need.

Some other things to consider:

Always have your food sessions be positive. They can sense your frustration. Maybe that means you simply get her to sniff some food, or to take a small lick of baby food. Be happy and excited...and let her rest for awhile. Come back in a bit.

She may have GI distress that is making her not want to eat...you can also ask your vet for sucralfate or try some pepcid or other over the counter remedy (get doseage info from your vet).

She may also have trouble swallowing/mouth issues (<--more of a CRF thing, but still possible), so a more liquid diet might be preferable. Any of the above meat slurries in a shallow saucer so she can drink them will get in calories AND fluids.

Speaking of bowls, you may have to change it up. Saucers, plates, shallow bowls, deep ones, raised dishes, dishes on the floor... cats are finicky creatures. It's weird how sometimes it's not the food, it's the presentation that matters :p

Try hand feeding--if you have a slurry, let her lick it off of your fingers. If it's more solid, like Fancy Feast, tuna, or tripe, etc., offer her tiny pieces at a time.

If it has been a LONG time, and she is not eating, you may have to syringe feed. (Some meds come this way too) It's not the greatest thing...but honestly, if they are feeling that bad, they don't offer a ton of resistance, so sometimes it's actually easier.

Good luck! I will post more if I think of something I forgot