I’m so sorry for your loss.
It’s good that you’re showing Pandora the body.
When my Honey died, Little groomed his face for a couple of seconds and that was it. When Peanut died, Little (who was now totally blind) was completely freaked out. Anytime he accidentally got near the body, his eyes would widen and he’d run in the opposite direction. The reaction can vary.
I’ll link some threads below which could help you with what to do next:
Human Bereavement
Looking after a Bereaved Pig
Edit:
Also, it’s not that none of the treatments you paid for were worth it. I see it as a guilt-free passing. When Honey died, we’d had all sorts of tests for him as he had liver disease. We did X-rays, blood tests, sending poo samples off, along with medications. He still passed away. But because of all those tests, I got the luxury of grieving without guilt. It’s very rare, actually, that that happens. Grief is very painful but it’s even more painful when you’re asking yourself what more you could’ve done, and if you’d just done ___ test or ___ test, maybe it would’ve turned out differently. But you did everything to ensure she was okay, so in her death you are able to grief without guilt of what could’ve been because you explored every avenue. I hope that helps put it into perspective for you. Be kind to yourself xx