I generally look after the hamster for a few hours before my sister gets back from work or is away overnight. So about six months Luna is used to me, well I hoped anyway.
We did know about the ball and how they generally not recommended anymore, she darts around in the playpen and hides so we were more concerned with getting her some exercise to stop her bar chewing.
Here's a photo of her set up, The higher shelf is going to be removed since Luna didn't like going up there. I'm waiting for when she's out of the cage to remove so I don't scare her. I have said to my sister I think there should be a lot more bedding, I also think she is peeing in her nest so her usual toilet area with safe sand is bone dry.
https://imgur.com/a/duLnq4u