its okay to not always be happy you know. Normally when things are not happy is when a person is going through a lesson to be learned and let me tell ya they usually suck kinda bad. But with pain comes growth. When a woman seems unhappy she is usually mulling stuff over in her mind that she has to work out for herself. Just be considerate and give her the space she needs to figure it all out while letting her know that you care and are there for her.