Lancelot was such a minor character, that I doubt they would suddenly introduce a relative when there has been no lead up to it whatsoever.
Yeah, I tend to agree that a child of Lancelot’s would be a bit random. Much as I’d like to see him again, suddenly bringing his daughter into it would seem a bit weird. Had to look up how old Sinqua Walls is, and he’s 28, so if Lancelot’s meant to be 30-ish, that’s barely old enough to have a teenage daughter.