So I have picked her up. She's in the process of getting adjusted. I just gave her a bath.
Her nipples looks like they have been nursed on before (she's not spayed), so that means that she's given birth before...

She's less than 4 lbs!!!! Her teeth are in REALLY BAD shape. It looks molded and the gum's rotting. It even looks like the gum is growing on the teeth. Will she need teeth extraction? There's a vet that will do all that for $200. Is that a good deal? She's super matted here and there...When you touch her, you can feel her spine, ribs, and just about everything...she needs to gain weight.
I was told that the vet suggested putting her to sleep because of the condition of her teeth...

Is that ever the case?? I feel so sad for her.
She pooped and her poop is bad (really soft). She pees A LOT and poops quite a lot too. She is fenced into a little area with a crate inside as she's not potty trained. I have placed potty pads all over inside the fenced area so she can go whenever...I took the door off the crate because I don't want her to be scared of it.
My top concern is her weight, skin around the eyes/muzzle, and her teeth. If you have any advice for me, please! I have attached pictures on here. She has the cutest ears!! They remind me of Dumbo