10 guys shoot, 1.6 hits,lets be generous and pretend they are all str 5 rapid fire (pretty much best overwatch I can think of for generics).. 20 shots,3.3 hit wounding on 2+=2.75 wounds, 4+ save always= 1.3 wounds go unsaved (possible ignore 1/5th if powerthrough pain
FNP). so even if you don't give her a bodyguard and leave her totally naked running into a wall of fire she's still going to have 2 wounds alot of the time to smashface.
As above take some meat shields.
Moral of this story.. your safe.. just don't do anything silly like charge 5 plasma gun units. Volume of high strength shots is the only really scary overwatch..e.g. chosen/mech vets with rapid fire str 7 etc..they're not everywhere (yet..my draft 6th ed chaos list
)