Today, Great-Granna took Riley to PT for me, and Cadance, Riley's physical therapist, was so impressed! She thinks that Riley has made enough progress that we only have to meet once a week now! We still have to keep up the routine and stretch frequently, but apparently, we're doing something right! Good thing, because we DON'T want Riley to undergo surgery!
Now, we're just trying to work out the flat spots in her head....
I've ordered some new pillows that are supposed to be good for positioning babies with torticollis and resulting plagiocephaly. It's called the "Infant Head Bed."

I have found that placing her on a contoured memory foam pillow during naps helps hold her head in the right position, but I need a better solution for sleeping at night, since I won't be able to check on her to make sure she doesn't roll off of it! Anyway, we're going to give these a try and see if they help!