There are people playing DayZ SA who are misogynistic and will shoot you if they realise that you are female, just as there are in society in general. Usually though people will shoot you because they are KoS, or Bandits, or because they are frightened or they think that you are setting them up/scouting them out for an ambush; I don't think it is because you are a girl per se. I can only speak for myself here but I generally try to help people and talk to them, however I am very wary, especially with bambi's who have nothing to lose, no matter there sex, colour, religion or creed.