Please Help Stella: she has a multilobular Tumour

A few weeks ago we thought beautiful Stella, our golden lab, had a lumpy eye due to hitting it on her dog kennel.  When it didn't go away and it started to affect her eating, we made an appointment for her to see the vet.  After some testing and a biopsy, we received the report to say Stella has a multilobular tumour of the bone.  She will need a CT scan of her head and chest to determine how invasive the tumour is.  This scan alone is $2000, which after the $1000 already spent, we just can't manage to scrape together.
Stella is one of the most gentle, sweet dogs you could ever wish to meet.  She loves all the kids- 6 of them, and her 3 fur sisters: Trouble, Ellie and Georgia, our cats.

As soon as we can, we will be starting whatever course of treatment that will have our girl Stella back to her happy, bouncy self.

While we know she is "just a dog" to most people, to us she is a loving part of our family.  Any and all help would be so appreciated, as it will bring us one step closer to making our baby pain free and well.