i just tried valéria as antag on hanging by a thread.
(it was moslty boring, as always with valéria antag imo, but well...)
all "young players", the highest was rank 3 or 4. the 3 others was 5.
and they had a doldren (rank5), but... i'm playing it so much that he is not really a threat to me, especially with valeria, since you have nothing to do except waiting for him...
so, indeed, they lost.
but each time, it took time and they had to use their brain, (few seems able to do that in this game) but they figured a way to counter me.
they just lost too much lives to find each solution, so on the last part, well, they died...
(yet on this one they could have just coordinate their attacks... but well...
they were not really efficient players tbh.)
anyway.
conclusion is, i still don't think a team even of new players can not win against her in this map. but you are right it is a map where she can be a real nuisance.