Thanks for those ideas - haven't found her birth records yet, or baptism, can't believe she'd be a Wilhelmina, again, too fancy to fit in with the names of the rest of the mob - but on censuses up she pops as "Minnie". None of them quite fit - there's another child "Mary" so that pet name's not likely - and on that line there doesn't seem to be a Scottish influence. Just really can't seriously imagine calling a child that!