My niece flew into stay with us for a week yesterday, to get away from a rough time at home. I asked mom if she still needed a booster, and mom said no she is 8 now. I may have told a small lie and said that in CO she would still need one unless she fit the seatbelt perfectly. Mom said that would be fine, and dn wouldn't mind. Here is the problem, dn is 52" and 110lbs. She does not fit in any of the boosters I own. She is too wide for the fr85, the one I had planned her to use, nb tb, nb cosco, Monterey, Monarch, and the nb harmony. I can adjust the shoulder belt with a clip, but the seat belt sits high on her belly. I have tried her in several seating positions, but none are a perfect fit. We are taking her to the mountains tomorrow, and I always worry this time of year with tourist unfamiliar with mountain driving. Are there other options I haven't thought of? Any suggestions????