AITAH For saying no 🤣 to going 😄 to a father-daughter lunch with my girlfriend’s niece?

So I am in an interracial relationship (I’m Black and She’s White). The other day my girlfriend’s niece asked me to go to her school’s father-daughter lunch. Her father lives out of state and her uncle is unavailable. I thought it was sweet.
I told her I’d think about it. My girlfriend asked why I did not say yes and I told her I’m worried about being a black man, going to a preschool alone, where the teachers don’t know me, for a little white girl.
She was taken aback by my response and told me she was disappointed that I was using my race as an excuse. I told her, “I could easily be seen as a threat, especially at a school with no black kids in her class.”
I could be overthinking this and leaving this little girl alone at her lunch while her friends have their Dads. So AITAH?
Update: Thank you everyone for your responses! I read every comment and took some things to heart.
First, I decided to go to the lunch and communicate with her Mom so the school could know I am coming.
Second, I talked with my girlfriend about her “disappointment” (I showed her the post). I told her I was not expecting trouble but I was wary of concerned parents who don’t know me questioning my presence or even calling the cops in front of her niece.
I compared my anxiety over the situation to her going to get gas for her car at night. She knows nothing will probably happen but is aware of the danger due to her existing as a woman.
Third, I understand that there was some confusion about my post. I didn’t outright say “no” to my girlfriend’s niece. I told her that “I would think about it”. Though I was leaning toward not going.
Lastly, thank you everyone for your perspective. I appreciate it