we extend rearfacing, it is better to bend there legs,and risk a broken leg, than a broken neck.
Yes, the law is 20 lbs AND 1 year, but it is much safer the longer they stay that way. My oldest was almost 3 when she went forward, the second one was over 2, and the baby was a little over 2 as well.
They did not care, they had no idea they could sit forward, so for them it was not a big deal.
United states actually have very lax carseat laws compared to other countries that have carseat laws.
Don't worry about the legs, she will get comfortable, most kids sit on there legs all day long anyway, watch your child play, watch how they sit, most will tuck there legs under there body, so really it is not bothering you.
We only had one other friend who kept there son rear facing until 18 months, but for me, carseats saftey is one thing I feel like it is not worth messing with.
I just read about a wreck in ca, where the car went 100 feet down an overpass, and the mom died, the kid, rearfacing survived, with minor injuries, the paramedics were amazed to find anyone alive .
heidi