How much painting have you done on her? This looks like the same thing that is happening with Ruby.
https://discourse.bountifulbaby.com/t/oh-nooooo/97463
I would strip her with Windsor and Newton. It appears to be paint that the factory used to perfect the kits by covering up small blemishes.
Contact @bountifulbaby and let them know and send pictures
Check your kit for more areas. My Ruby kit had several