We are finally getting to see the inner side of Avantika.
When she left Harish, she invested everything into business. She turned her dard into ego and power. She has been fueled by years of hurt and misunderstandings. She channeled all of that into working and building a business, but she was never all about property or money. Never once did she show arrogance when it came to money. In fact, she has always been fair even with the Gupta's when it came to money.
Her ego was all about her pain from the misunderstanding. Now that she realized she has been wrong, and there has never been anything between Harish, she's let go. She let go of her overly arrogant attitude and became her previous self.
Even through flashbacks we have seen that she was not this arrogant before. In fact she was really soft. She's always been stubborn, and we have seen that still, but she's sensible.
She never really cared about money over family. And she's shown this through giving up her position to Anuj if it means everyone still living under the same house.
I don't think this is showing inconsistency with her character, rather the many sides of her. Well done CV's.. Well done.