Aunt said she was happy to see her niece. How to reply?

My niece is also very happy to see her aunt. "Auntie" usually refers to the father's sister, and is sometimes used as a courtesy title for a female elder who is not related by blood. In southwest Anhui, "Ling" is a dialect title, which is consistent with "Auntie". In some places in eastern Henan, the Hui people's "Ling" means aunt. In some places in Ningbo, my father's sister is called "Momo" and my sister is called "Auntie".