I think it depends on if she's done this only recently, or if maybe mom is just now noticing it. My grandson was referred by his doctor for tilting his head in one direction. They said some people do it and need physical therapy at a young age to correct it. We watched him and just never noticed it. So we didn't take him. We figured we know him better than the doctor. Maybe he slept oddly that day and had a stiff neck.
I have since noticed that Andrew Wommack (television preacher), tilts his head toward his right, almost all the time. Well...I'm not sure how the camera works. Maybe it's his left LOL. Anyway, he almost never has his head straight up and down. Now that I know it's a problem, I swear that bothers me to watch him LOL. I probably never would have noticed before.