She looks like she may be growing a clutch of eggs. My Melleri laid an infertile clutch about two years ago and before she did, her belly was HUGE and she would bask it in her heat light and hang it in between branches. She also began acting strangely when she was ready to lay. You'll need a very large laying bin (we used a full size trash bin) if she decides to lay.
I do want to note, that in the two years I've had her, she has only laid once. There have been other times when her belly has begun to grow, looking like she was growing eggs, and then it goes back to normal. I've been told that Melleri can reabsorb their eggs, but I don't have any proof of it.