Help me keep my best friend, Sandy.

My name is Amanda, and since I was nine years old my best friend has been a Chihuahua/ Dachshund mix named Sandy.

Recently she developed multiple tumors on her tummy and her chest, called mammary tumors(basically the dog equivalent to breast cancer). With a recent visit to the vet after one of them ruptured, we were told that they need to be removed immediately if we want her to continue to live a long, healthy life.
Her tumors are growing at a rapid rate and it seems new ones are popping up every few days. The vet said once they reach the inside of her chest (which they positively will), she has about a month to live.

I need this money so my baby girl can have this surgery to remove the tumors.

I would never otherwise ask for help but I'm not ready to lose my best friend, and other than these tumors, she is a very active, playful, and healthy dog (especially for being 13 years old), and has many years left.

This pup has saved my life countless times, and now it's my turn to do everything I can to save her.
Please help my baby girl.