It would be nice to see pics of all the babies produced by that female - especially the other black pastel.
Personally I think she might be hypermelanistic, kind of like a Sable. She looks a little like my male Sable does, but not my female, then again they are very variable. I also think I see some hypermelanism in the baby.
I definitely don't see leopard, and don't see a resemblance to either leopards posted. Leopards have a very busy pattern with alot of extra black - the black pigmented areas are larger. The pattern on the back drips and connects with pattern on sides, the side pattern is oddly places and many times busy and squiggly.
Other than the fact that yours has the black lines where the 2 dots of the alien head maybe, it looks very typical of wild-type pattern, IMO.
I have many normals with that pattern (lines and not dots in the blotches) and although I like them and think they are really cool, this doesn't make them anything special.
Posting pics of the babies may show if there is something else cool at work there.
Thanks for posting