As for the plant, if she's eating it, I say toss it NOW. It's not worth the risk... she could get sick or die from swallowing plastic like that.
There's no need for sand in my opinion, really. And small gravel (like for fish) is also a pretty bad idea because turtles can eat the little pebbles and choke to death. I had river rocks in my tank for the longest time and ended up taking them out because all they do is collect and hide food particles and algae. The filter can't get to the poop and the food that has settled beneath the rocks, so all they do is just create messy tanks and cloudy water and grossness. Turtles do fine without substrate on the bottom of their tanks. But, if you want more river rocks I'll ship mine to you if you'll cover shipping. I hate them.
I love the stuffed turtles there, by the way! That's a friggin niiiiice tank stand. Lucky duck! The eggcrate ontop and the hood look really nice. Everything's so streamlined! Mine is totally haphazard looking, haha. But you should get her a medium-sized tank ornament. It looks really empty in there and turtles like to hide behind stuff and have something to anchor themselves to while they sleep. (Be sure to not get one that she can swim through and get stuck in, though!)
BullDog wrote:I always love the look of tanks with a background... Maybe I should think about getting one!
I have one for a 30 gallon if you want it.