Lae believes that it is she who saves you, not you who saves her. In the first act, her quest barely moves, that's the problem, which means we can't get closer and find more understanding. You also need to understand that she will be angry if you are soft on others. I don't see any problem with that, but I do see people who are used to female characters being soft and responsive. That real problem here...
There is no problem with this, except for the fact that the only two characters who don't mind if you do heroic things and help people are both dudes (Gale and Wyll). There are no good, or even neutral-aligned, female characters.
People are not complaining really that the characters exist, only that there's not the same diversity of outlook among the female characters as among the male characters. Lots of people (based upon statistics from other games, the vast majority of players) have no interest roleplaying evil.