I think you're onto something there. First pic of mom I was thinking Yellow Belly, but after seeing her belly shot definitely not a YB. She is probably something more similar to the Het Puma, which is compatible with YB and Specter... You can see pics of Het Pumas and Specters (and belly shots) on Albey's page here...
http://www.albeysreptiles.com/ball_col.htm
I'd be putting that girl to an Ivory in the future.