It's heavily implied that she is very related to Blossom but not in a "just came out of her womb" way. Judging by the thrown flashback, some have the theory that Aku just took Blossom's dead body and used it as a basis to make a daughter for himself.
On an unrelated note the archive system of SNAFU is truly shit. And iirc although Bleedman had this idea, the new writer he has was the one who said "sure let's go with that!", apparently none of his actual -and previous- writers wanted to go with a Aku/Blossom child.