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It is hard to see them begin to age & it starts to show with some hams earlier than others, some from about 18 months others not till later.
Sleeping more is quite normal but you may find she’ll be happy to come out if you coax her even if it’s just for a short cuddle time or a little run around, you just have to work with them & see how things go.
If she can still get around her cage ok then you probably don’t need to change anything but if you have shelves or different levels it can help to move everything to one level so it’s easy to access.
It’s a good idea to keep an eye on their teeth as they age, if they don’t eat or chew so much or if they eat softer foods they can get a bit long sometimes.
It’s a good idea to supplement their diet with some of those softer foods like porridge or ham safe baby foods, even when their teeth are still ok they often appreciate them.
You can also give extra flax seeds & a drop of evening primrose oil to help keep the skin & fur in good condition.
Keep an eye on her weight, it’s important as they get older to do regular health checks as they are more likely to develop health issues, weighing regularly as part of that, small amounts of weight loss are normal in older hams but a continuous or sudden loss of weight may be a sign of illness & the need for a vet check.

Gorgeous photo of. her, she looks lovely.