Joy learn a slightly weaker Humanoid form spell in her long years.
5'`10" Tall, but squishy and soft skin, even a bit stretchy. Her body is very warm to the touch and being near her seem to help accelerated healing of the body by natural means, not by magic or the like.
Despite her largeness, she actually a bit light, most of her inner compose of fluid or air though she does not understand any of that herself. she is only 103 LBS
While she does have Bone and Flesh, it seem she is able to bend and form them at will, making them able to fit and fold to get through tight places no normal person can do.