Advice for Adjusting to Time

Hello ladies. My husband, our daughter, and myself just returned home three days ago from a family trip to London. I really need advice for helping our daughter adjust to our time zone again. Our daughter is only six months so I know it won't be easy, but any advice will be helpful. We traveled to California (which is a different time zone) when she was three months, but the adjustment wasn't near this hard. I guess because California was only two hours different and I believe London is eight. Any tips, advice, etc. will be appreciated.