Save Lilo

Curled up in the arms of an infant is Lilo, my daughter's cat. Only a few months younger than my daughter, Lilo has been a part of our family since my daughter could form memory.
When there's a new adventure to be had, Lilo would be scooped up into our daughter's arms. Whenever our daughter cried, Lilo ran to her side. Like siblings, the two have looked out for each other for as long as they've been together.
As they grew, we would even take walks together. Lilo, always an outdoors cat, would walk alongside us, rub up against us, and bound about in circles wherever we went. She would even stop to say hello to other passerbys in the neighborhood.
But this morning, a neighbor came to our door in a panic. Lilo was in the backyard of an empty house, her belly split open, her breathing shallow. Hit by a car? Animal attack? Human? We only knew she needed help, our vet wasn't open. Another vet was too busy to see other patients. We rushed Lilo to a pet emergency room, where she remains as I write this letter being treated for shock before they can even attempt to treat the wound.
But even before they saw her, the vet needed money upfront - $2,300. Thankfully, given the cost, they accepted a deposit, but we have no idea if we've seen the worst or just the tip of the iceburg.
Can you help us save Lilo?