Urgent Bunny Labor Issue - Advice needed

I’m in a very urgent situation with my bunny and need advice immediately. My five-month-old mini-rex has been in labor for over a day now. Yesterday late morning, she gave birth to one stillborn kit. Later in the day, another baby got stuck, with its feet protruding from her womb. Following advice from a retired vet, we tried to gently pull the kit out, but only half of the baby came out (the upper half is still inside her). Since then, she’s been having contractions and trying to push, but she hasn’t been able to expel the remaining part of the fetus.

I’ve given her calcium supplements (Tums) to help strengthen contractions, gently massaged her abdomen toward the birth canal, and kept her hydrated. I’ve also offered her other foods to support her energy and that are high in calcium. Unfortunately, no vets in my area are willing to see rabbits, so professional care is not an option. Yes, I have called multiple places. I live in a pretty rural area, so vets for exotic animals are very rare.

Is there anything else I can do at home to help her pass the rest of the fetus? Are there any over-the-counter medications or remedies that could induce labor or make this process easier for her? At what point should I consider euthanasia if she cannot pass the fetus? She’s still eating and drinking a little and is overall acting fine when not trying to push. I’m very worried about infection or further complications. Any advice would mean the world to me and my bunny right now.

Basically, what else can I do?

Thank you so much for your help.