Update.

Mom called back last night. Grandma is worse off than we thought. The upper arm break is clean and can be reset easily.

BUT

She needs a metal plate and 4 screws in her wrist, so she needs surgery.
Mom wasn't sure when they'd do the surgery, but figures it would be some time today. She also said tehy won't be putting a cast on grandma, just a sling. So grandma will need X-rays once a week for the next 6 weeks.

On the plus side, grandma now has a new nick name: Old Iron Fist.