Walking down the aisle

In need of an idea and advice. My fiancé and I will be accompanied by our parents waking down the aisle. Unfortunately, my mom passed away a few years ago, so it will be just my dad walking my down the aisle. I am close to my Nina who so happens to be my mom’s niece. My Nina has been an important role model in my life and someone that was near and dear to my mother as well Especially during her last moments in life. I had asked her in a card to help me walk down the aisle with my father but now I believe my dad is thinking his position in walking me down and “giving me away” is less to him. Aside from talking to him to understand the reasoning of why I chose her, how can I incorporate her in some fashion during the ceremony?
On a side note, when my sister got married, my mother was in her palliative care state and my Nina wheeled her down the aisle prior to my sister and dad walking in.