My girlfriend says she wants to take things slow and work it out what does she mean what do I do?

If you are old enough to ask this question then you need to practice good communication skills. You have been together long enough where you both should feel free to discuss any problem you have in your relationship. You may be pushing the relationship too fast for her. If you haven't had a sexual relationship and you want it to start she may not be ready for this. If you are talking about a future with her then she may want to stay independent for awhile longer. She holds the key to your question so start by learning how to communicate and you do that by simply asking her what she means by that comment.