Well, there are some gory parts, but I don't think that should
be a factor, unless she is really squeamish. That said, this is
quite unlike most war movies, in that it attempts to represent the
soldiers as normal human beings rather than people who became
mentally disturbed or pyschologically shattered as a result of war.
It also looks at how we create images and ideas of heroism and how
they are manipulated for gain. Hence it can be really quite
cerebral for a war movie.
On the whole, I'd recommend it, though the choice of company is the
individual's decision. I have no comment on that.