If I were in your shoes, I'd get my girl in for an emergency spay to abort the pups and prevent any future accidents. That's a really late age for a maiden litter. It's likely that a pregnancy at her age will trigger all sorts of back issues and other health problems. Also, keep in mind that her EGGS are as old as she is and old "stale" eggs often can't produce healthy pups. This just isn't a pregnancy I'd let proceed. I know it will seem like I'm taking a really hard line on this, but trust me, as many years as I've spent in the dog world, I've seen a lot of stuff I wish I hadn't seen, including older bitches trying to whelp a first, deformed litter.
To all idoggers, please note that this poster is not IN the United States, but rather overseas where spay/nueter is not as big of an issue, nor is over population. Let's please respond accordingly.
A house without fur is not a home.
Glenda