Sunny's Surgery: Please help relieve her pain

Sunny is the sweetest, most loving cat, but unfortunately, she has to get all of her teeth pulled as she is 13 years old and they are rotting. She hides it, but I can tell that she is in a lot of pain. She flinches when I go near her jaw, and she used to be quite happy and playful for a senior cat, while mostly she just sleeps now.

I have saved nearly half of the vet’s surgery estimate, and I could really use some help saving her the pain of the time it would take me to get the rest. I would greatly appreciate anything you can give. Thank you.

Update: One of her upper incisors fractured at the root and needs to be removed as soon as possible, along with two of the other most affected teeth. This procedure alone is going to cost upwards of $2000.