Thanks for the replies. The blower will sit in a double car garage that is mostly empty. She'd use it on the driveway, so no lifting. Her front porch is mostly covered, and it's easy to push the snow onto the driveway from it.
She's used to a corded lawnmower, I remember her mowing the lawn sometimes when I was too little to do it. I was worried about a cord on a snowblower, your pattern is not so regular, it would be easy to get all tangled up.
Fortunately she's got a good pension so price is not an issue. (And if she didn't, my brother and I would still make price not an issue.) So we're leaning toward the battery model now.