Yes, main character actress is very good looking and should have more work in future.
As others have mentioned, her swimming in clothings/boots makes no sense giving that earlier in movie she want swimming in underwear and said it was too cold to swim. Wet clothing and boots do not make you warmer, they make you drown.
A good chunk of movie was on her trying to boil water to purify it. However, she was at a pristine Canadian lake.
There has to be insects and worms in the forest. Why not throw these into lake to attract fish and birds and then try to catch them?
Why not big fires rather than the small one she used?