Try to understand her in all your ways.Love her whatever attitude she has and believed me everything will fall on its place.
 Women are very complicated and moody but most of them are just OA as in Over Acting.
Girls will always be Girls, that's there nature, let us just embrace it and love them as much as we can do.😁
And please dont generalize, not all of them are like your girlfriend, I have known alot of girls who are cool and likeable.