I just do what I'd be doing if she weren't here. Usually I am upstairs on a Zoom call, as that is scheduled at the time she arrives, but if it's not on for some reason I just do what I fancy. That might be cleaning something else or watching a film. As I see it, it's my house and her workplace for the few hours she's here, so it's not awkward if I am doing nothing and she is working. She seems happy with that too.
When she arrives we have a quick chat about what needs doing, then she just gets on with it. If I have a coffee I make one for her, and she knows she's welcome to help herself if not, although she usually brings one of those Stanley cups with a cold drink in it. I've known her for years (her mum used to clean for me and she'd sometimes come along in school holidays when she was little), so we just work around one another.
I know she's not keen when clients want to chat all the time, as it stops her from getting on, and then they complain. She has a lot of older clients (as do most cleaners probably) and this can be a problem, apparently. She is very kind, and recognises that people can be lonely, but she often has another job straight after, so can't stay behind when her time is up, and she doesn't want to leave work undone and get complaints.