Saving someone elses build does not count as stealing it UNLESS they try to claim it
as theirs.
Mystery lady 79 is saying here that she saved your build, but unless she tried to claim it was
hers afterward (and according to the evidence you provided, Mystery lady 79 did no such thing),
she didn't steal anything.
For all you know, she could've just saved your built for offline/single player use. That being said,
the fact that she felt it nessicary to tell you she had saved your build, followed by Jizz Cakes perma
banning you for no discernible reason is highly suspicious, so at the very least we should be cautious
when dealing with those two, but until i see solid evidence showing that she tried to claim ownership
of your build, i cannot call mystery lady 79 a build thief.
