Do things to spark up things a little more. I think she needs more stimulation from you. Maybe, start doing things that turn her on more. Start improving yourself. Workout more. Become sexier. I don't know what you look like, but you might want to consider my advise. Wear better clothes? New haircut? Be more spontaneous? Plan random trips?
I will do my best to reply with an educated, humble and honest answer. Ultimately, it is up to you whether you want to listen to my advice or ignore it completely. Sometimes, my advice may be wrong; occasionally, it will be right. Regardless, I want to do my best to give people answers they are seeking.