I don't know, but as usual the internet can provide evidence of a sort.
Here's a photo of her with four guys who appear to range from 6" to 18" taller than her:
http://41.media.tumblr.com/f091ab5035f80ca6c281790c59a5719c/tumblr_n0wsbjAHNp1sm
The guys appear to be ordinary humans, so it seems safe to conclude that she's no taller than about five foot two.