I have just seen the clip.
I also hoped there to be a 'Catholic discussion' on this.
A key point of the movie is that Mother Teresa had to 'break her vows' to start the 'Missionaries of Charity'. Basically, she had to get permission to do what she did...
“Break her vows” sounds much more dramatic than “received the permission of her religious superior and the local Bishop to leave religious order A and found religious order B.”