I don't see the entire extended Abbott family coming to town just to visit Delia in hospital. Heck, they didn't do that when Colleen was brain dead and about to be taken off life support. I think she will be killed and at some point her corneas will be donated to Connor. That just really seems to be where they're headed with this.
As for who might be the driver, it's a real possibility that it could be Billy. .
I think you are right. She is going to be killed and her corneas will go to baby Conner.
I think the driver could be Vikki. That would throw some angst into Villy.