more mad the more I think about it...

Yesterday I was at the grocery store with my niece whom I have custody of. Well a Spanish woman walked up and says wow she is beautiful is she yours? I explained that I adopted her bc my sister was unfit. I think she only understood that I adopted her and didn't get that we were related. She goes on to tell me how mad she is bc her son gave his baby up for adoption to a person who looks like me " light hair and eyes" and how the baby will never learn Spanish and always feel uncomfortable living with people who don't look like her. This is my niece 
And this is me
Does it really matter as long as she is loved unconditionally and given everything she needs. It just really upset me. I know she doesn't think that when I look in her eyes all I see is her love for me. It just makes me mad that one day she may wonder bc of people like that lady!