In all seriousness, get her bloodwork done. A cat that crazy about food might have a thyroid or other medical issue.
You’ll probably have to separate to feed for a long while yet. If she starts to calm down about it, maybe you’d be able to try feeding in like…a dog crate, perhaps. In the same room, so she can smell their food. It’s a good test while allowing them the ability to eat their own food peacefully.
You can also try bowls which only open for the right collar. Amazon sells them, but they are NOT cheap: https://www.amazon.com/Sure-Petcare-SureFlap-Selective-Automatic-Stress-Free/dp/B00O0UIPTY/ref=sr_1_17?crid=O9337BSZVCPE&keywords=cat%2Bautomatic%2Bopen%2Band%2Bclose%2Bbowls&qid=1695900727&sprefix=automatic%2Bopen%2Bcat%2B%2Caps%2C57&sr=8-17&ufe=app_do%3Aamzn1.fos.f5122f16-c3e8-4386-bf32-63e904010ad0&th=1






It sounds like things are going well! Hills c/d diet and making sure he gets plenty of fluids to avoid more crystals forming is key. You can introduce a cat water fountain (a stainless steel one) to encourage more drinking or see if he’ll enjoy a watered down churu treat from time to time. Sometimes it takes them a little bit to want to use the box if they associate it with the straining. You can try putting the pee pad in the litterbox to see if that helps bring him back to going in there. Keep us posted!