Our family dog needs help

We rescued a gorgeous, sweet girl a few weeks back. Her previous owner before had abused her horribly. The only human contact she had for the first bit of her life was only when she was being beat. Then the man moved and left her tied to a tree to starve. She was found by a neighbor & rescued. She contacted us to see if we could take her in and if we wanted her. We were hesitant at first but now very happy that we took the chance. Our Dixie Mae is a perfect fit to our family. However, vet visits are far from free or even cheap. We are desperately trying to get her spayed. Saving up a little at a time. But with not knowing her last heat. We didnt know how much time we had. And she's now in heat. We live in an area where other dogs are allowed by their owners to roam wherever they want. We don't want to risk her getting pregnant. She has had a litter prior to being rescued. We know how beneficial to her health it will be to get her fixed. It will also help put our minds at ease for her sake. We've already had an issue with one dog trying to get to her while on a walk. Could you please help us come up with the $250 to get her fixed as soon as possible? It would mean more than the world to our family!!! We have CashAPP $grizzlymomma and PayPal. If you would like to use PayPal then please send me a message and I will give you the email address to use. Thank You so much to anyone willing to help!!!!