You say he takes her every morning, but has the teacher met him?
I haven't met all of my children's parents yet. We are only a week into term, and there are 34 families to get to know. When I open the door in the morning there is a sea of faces. Some parents have introduced themselves, and some I have noticed, but others hang back a little.
At the end of the day I release them to the person I'm expecting to collect them, but would exercise caution if I had any misgivings whatsoever.
I would not see your situation here as racist.
You are saying that she has seen him dropping her off every morning, knows him, fully understands your family situation but refused to hand dd over because she was intentionally being cruel?
When actually there is probably a much kinder, more sensible conclusion to draw.
Your dd was obviously handed over eventually, how did it come about after initially refusing?