I use two playpens attached together for a bigger play area. Tinkerbell isn't much of a jumper and this has worked for me so far. But I am going to make it more secure by attaching large sheets of cardboard to it.
I had tried to let Tinkerbell run freely in the house and even with me watching her, she still found cords, and wall corners, and wall molding, chairs, etc to chew on so the playpen has worked fabulously for me.