I can understand she doesn't have survival skill, and has to use what she got, but I still do not like her. Most especially the way she killed that person. She waited for someone to over power him, then just hacked him to death, the bitch.
The main character was smart not to allow her to follow, because she would turn on him or kill him the minute it suits her. Having a turncoat at your back is the worst thing to have when you're trying to survive. Meat head will learn that the hard way.