She's all right, but obviously, she can't be left alone with the stairs. To protect her, we've moved the loveseat in front of them. It's not ideal, but until we find a gate, it's what we're doing. And it's keeping Albus off the stairs, which is a good idea as his joint issues make them dicey for him, as well.
The cats weren't initially pleased by the change, but now, they love camping out on the loveseat and daring the dogs to try and pass it without catching a (mostly playful) paw. *snorts*