Platforms are wonderful additions as Serendipity said as they offer more for the hammie to explore as well as offering places for them to sit under. You could also try incorporating different substrates in her enclosure to add that variety too. Have one side dedicated to burrowing/nesting and then gradually change the substrate to offer more variety to walk upon. You can section off each area with the addition of bendy bridges but always check to make sure that the gaps between each stick, when sat upon it's side, isn't large other wise hammies can get their legs stuck. You could even section one part off completely as a sand bath
Youtube and Pinterest are fantastic for ideas so definitely check them out