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Oh, that makes sense. I thought you meant that you had learned something new from the breeder, about the mother of that pullet.

Since the mother had muffs, that explains where her daughter got them. ISA Browns are hybrids (a cross of two breeds), so it's quite possible for some of their chicks to inherit different genes than others. Dominant White turns black to white. Yes, it can cause black lacing (or partial lacing)...

Muff/beard is caused by a gene that is considered to be dominant. So breeding clean-faced birds should always produce clean-faced chicks. If there are exceptions, I haven't seen them or read of them. Lacing is specifically an edge (often black) around a feather with a different base color...

Dun, chocolate, and khaki are dilutions of black, so no you should not be seeing leakage of any of them. Chickens with the gold gene can have many different shades of brown (red, gold, buff, rich browns, drab browns, etc.) I'm pretty sure that color is caused by the gold gene, but I don't know...