Yeah, I tried a few times and just couldn't get it. Yesterday she weighed almost 47 lbs. She's gained 8 lbs since her last weight check!! I don't know how I was so off...
Anyway, our only other seat that could work for Faith is Joey's Smart Seat, but it's way too wide for that spot. Last night, I ended up trying the Radian in belt positioning booster mode for her. Her shoulders were above the 4th harness slot and she's 45" tall. She can buckle it, she sat really well... Not 100% ideal since she's 3 lbs shy of the lower weight limit for booster mode, but it's the lesser evil I guess...
Joey and Grace are still rear facing so I'm a bit stuck on being able to move Faith up to the 2nd row. Joey's Smart Seat cannot go rear facing in the middle spot of the 2nd row unless there is an open spot next to him since it's almost impossible to get him up and over the arms otherwise. He's not even two so rear facing is the only option for him. And the girls cannot sit next to each other. They just scream, fight and annoy each other the whole time.
The only other option I could see would be to flip Grace forward facing and give her Faith's spot in the car while moving Faith to the 2nd row next to Joey. But I think I prefer having Faith in a seat that fits well other than her being 3 lbs shy of the booster limit over moving Grace forward facing. Grace is almost 4, but she's only 28 lbs. She's just so petite...
I'll probably buy another seat this week, I just have to decide what. I'm thinking Joey's Smart Seat should go into our 2000 Civic full time. The seat can adjust to fit any of our three kiddos pretty easily, plus the center seat of the Civic has a lap belt that works really well for the Smart Seat base. We could pass Faith's Radian RXT down to Joey and they both can stay rear facing in the 2nd row of the Pilot. Then, get Faith a dedicated booster. I'm leaning towards the Oobr right now. The Frontier is also an option and I could keep her harnessed there, but she is so thrilled about the booster mode... Decisions decisions!!