A noodle is an acceptable way to recline a seat. But you said incline. Where did she put the noodle??? We use noodles so that children aren't staring out the back window, not to change how they're looking at the ceiling. If he was laying too far back and she used a noodle by the front of the car's seat, then she didn't do it properly at all.
She didn't have you install the seat???? Then she didn't do her job. She's not an installation service, or she shouldn't be. She should be an educator. Make sure she can get it in properly (such as knowing that a noodle would help, that you can't use LATCH in the center of most vehicles, how to lock the seatbelt, that sort of thing) and then show you how to do it and make you install it yourself so you CAN move it around and reinstall it safely. The only people I don't make install seats are those who are so darn pregnant their arms can't reach past their bellies. They get a get out of jail free card. Everyone else installs their own seats.
And size has nothing to do with it. I installed a seat last week that the lady said had taken two firemen each much larger than myself (I'm 5'2" and a size six) and I was able to get it in much better than they could, AND teach her how to do it herself. She was tall and thin, no doubt weighing less than one of the firemen who had done it before. It's about technique, not about size.
If you can track down that woman again tell her you want to be taught how to do it yourself, you want her to show you hands on step by step what she did, and you want to leave with a seat YOU installed. That's what she's supposed to do in the first place. What she did was inappropriate.
What car do you drive, what position did she install it in, and did she use a seatbelt or the LATCH? I feel we need to double check her since she didn't do her job properly.
Wendy