While the
Regent is the tallest, highest harnessing seat on the market, it will likely hold your child in the harness longer.
The new
Graco Nautilus has top harness slots of 18-18.5" tall and will harness to 65lbs, then
booster to 100lbs. These seats are only in WalMart and run about $150.
With her torso height that tall, I don't think I would even consider the Apex 65 as the top harness slot is only 17-17.5" tall.