[Bay-Bay]

Bailey is now 6 months old and weighs less than 2 pounds. The vet wouldn't spay the little girl I had before unless she weighed at least 3 pounds, she said it was just too hard to get the anesthia right. So, does anyone know if it can be done? Will it be harmful to her? Is it a big risk?
Please, any help would be greatly appreciated. I know she needs to be spayed, but I don't want to put her at any risk, so I am torn.