Left torticollis

My LO is 6 weeks old and has left torticollis (tightened muscles on the left). She only turns to her right. I have been to physio 2 times now and they taught me some stretches to do for. It is getting stressful that baby still prefers her right side. Any parents with similar situation? How long did your LO take to be cured of this situation? #firstbaby #pleasehelp