I added on extra panels here it was only one high, she was hopping in adn out which I didn't mind while I was awake and around to watch her but during the night or day when I'm not around...
The shelves seem pretty sturdy, she jumps on them and they don't bend and the walls don't move. She doesn't seem too sure of the shelves though, she only stays up there if I put treats on them otherwise she lays under them all sprawled out on her back.
She's still here, the other half doesn't like it but she's still here and adores her new home, the first day in it I have never seen her binky so much.