I dont understand her mood swings at times.Sometimes she is showering too much love and at other times she is cold and distant. I had wanted a stable relationship with her where i can predict her at all times to see if she is suitable for longterm.
Not all women are like this. Exactly how cold and distant does she get and is it for no reason? You express that it is an unstable relationship. That doesn't sound like a good relationship.
Is this is a sign of immaturity on her part?
It could be. Young women sometimes don't understand how fortunate they are to have someone who loves them. They can easily take a man for granted.
what does a polish gf want or expect in a relationship in general ?
If you really want to continue with this type of relationship, just be consistent. Don't let her mood swings affect you and cause you to treat her differently.