What significant event in Oluo's life did not happen until she was 34 years old?

One day when Oluo was 34 years old, she received a voicemail from her mother. Her mother said that she had just had an epiphany about the topic of race and she wanted Oluo to call her back. When Oluo called her, they ended up having a very productive and enlightening conversation about race, an event Oluo claims had never happened before that moment.