"They were so scared what someone very close to them has done and are looking at moving house. They don't want to take her back and have someone do it again.
"They are ... absolutely devastated by the whole situation," she said.
She did not believe the shooting was accidental, saying there were similar attacks on cats in the Howick area last year. A Givealittle charity page saw $3300 donated by last night.
Vets removed the arrow yesterday and sent it to SPCA investigators for fingerprint analysis. Police were making inquiries, a spokeswoman said.
Ms Spemann said it was possible the cat could lose her eye but that would not be until stitches were removed. She said Eileen was in good spirits and would stay at the clinic until she recovered then be rehomed.