Large vets bills for our poorly dog

Our dog Bella was in a freak accident in park on Mon 14th May. Chasing after squirrel and hit a bench. She sustained multiple injuries which has led to massive vet bills. We had her insured for costs up to £2.5k but her bills are £8k. We live on limited means and these costs are a bombshell. Whatever you can afford would be so very appreciated. We live in whalley range Manchester. I will commit to 100 hours vol work or charity work to honour donations. Please please help us.