My friend was leaking milk and she wasn't pregnant, but she had major whacked out hormones and they were able to treat her.
Is your girlfriend late for her menstruation? If so, then she needs to take a pregnancy test. If she is not late for her period then she needs to see a Dr because her symptoms means something medically is wrong.
A woman does not usually have breast leakage until they're several months pregnant. Hair loss can happen during pregnancy but it's a little rare.