Like all other OUAT fans, I have recently been binge-watching the fourth and fifth seasons on Netflix. Season 6 can't come soon enough! As I was watching one of the later episodes of Season 4, "Heart of Gold", Regina said a line to Rumple that I could not stand:
"You made me a monster! But I won't let you do the same to Emma."
She has also said this line a couple of other times throughout the series.
I do admire Regina's character development. I really do. Having friends who cared about her and Henry made her her best self. She has changed for the better, although maintaining her sass. ;)