HELP Interstinal prolapse stray kitten Luna with vet operation bill

Luna was rescued by a neighbour when little, her sister was hit by a car crossing the road. Luna suffered from an interstinal prolapse, which attempts to fix few times were unsuccessfully, so she underwent an operation. We took the opportunity and also spayed her through Mandry's Fund - Cyprus feral cat project. Luna is approximately 5 months old and has her 1st vaccine. She is scared of other cats, which makes me suspect she might have been bullied. The neighbour could neither afford her vet care or to keep her safe so I transfered her to KittieGarden Safe House. I need help to cover her vet bills, since the house is full right now, expenses are high and our vet bill is already high!