I don't know but I have a female, approx. 9" nose to vent, 6 or 7 years old, that has always periodically glass/wall danced, likes to periodically dig around & is one of the ones I mentioned that has previously done that behavior, I just weighed her & she weighed in at 736g, never bred, I'm not worried.
She's a nice big chunk but she is large all over. Pig is just big in the belly, really, really bloated looking. I'll get some pics tomorrow. Pig will be leaving me soon though, she is going to someone with a ton more experience with gravid females.
Breeding may or may not help, so don't breed her unless you want to breed her. This behavior is defintely a pain in the butt and can go on for 2 to 3 months. I've had females act this way and quit the minute they bred to a male,or I've had females act this way, breed to a male and keep acting this way without ever becoming gravid. I've also had them act this way and never breed to a male, although they would constantly mount other females. I always assumed I didn't have a dominant enough male to subdue them, total waste.