I have read many fiction that Chrysalis changed herself because of the “strange” friendship of Tirek and Cozy Glow ,so I do some change of my old Reform-Chrysalis design.
In another time line,during the battle of the end,the three villains stealed the bell but the Grogar(yes,the real one) had been monitoring their actions all the time,Even after he exposed their deception, they still remained obstinate. Enraged, Grogar used his great powers to snatch the bells and drain their magic, claiming that he alone could conquer Equestria.
After that, faced with the overwhelming Grogar, the three villains reluctantly share their power to fight this powerful demon along with the other creatures. But in this collaboration, and in the memories that preceded it, they felt a bond and began to feel a kinship. After Grogar has been defeated, they ran together across the land, through all sorts of hardships. In a crisis, Chrysalis acknowledged her friendship with them in her heart and ushered in a transformation.
After that, with the help of Starlight, Chrysalis tried to return to the Changeling Kingdom, not as ruler or Queen, but as a student and mother. Although the changelings had mixed opinions about her, But she still has plenty of time and opportunity.She had a lot to learn and understand from having friends around.