^
The hassle of dealing with it, at all, might be enough to prompt her to act. It's not just a minor issue. If she causes the dog to have arthritis or other joint pain, not only would it cause the dog pain in the now, but possibly chronic pain even after the nails are cut, and it'd make her less adoptable down the line. This is just something we see and are aware of, no doubt if the cats or dog showed any other signs (not eating as much, bathroom problems,etc.), I seriously doubt she'd jump on the phone to make a vet appointment. I can't believe she talked about wanting kids..can you imagine?
She likes to point to her weight, but it's stuff like this that makes people hate her. We see her spend money frivolously and go ridiculous distances to get food, then not provide her pets basic care. No one has suggested she do anything excessive or extravagant, just the bare minimum...and she won't even do that.