This is utterly ludicrous. You’ve gone for the worst possible assumption based on absolutely nothing instead of considering several of the considerably more likely and logical scenarios.
— teacher genuinely didn’t realise. Perhaps was distracted by a sound, her name being called, an event, a touch which made her turn.
— teacher was strategically trying to keep as many children dry as possible so turned or moved her body to give coverage to the most amount of children. Your child wasn’t in that lucky position with the majority so was left uncovered for literally a few seconds.
— teacher was alternating between children to give some of the chance to be out of the rain for a few seconds. Taking turns. She was holding it over your daughter and then may have switched to a group of children to give them coverage. The fact that she was holding it over your daughter originally and not over some others and then switched to holding it over some others and not your daughter implies this.
— Perhaps she saw you come to collect your daughter so knew within a few seconds your daughter would be taken home so instead held it over some children who might be standing in the rain longer whilst waiting for parents she hadn’t seen yet.
— teacher might have been responding to another child saying something like “Miss can I have some umbrella!”
I dont understand why you have immediately gone for the least likely scenario based on no prior pattern of behaviour whatsoever and dismissed the above? The fact that she was originally holding the umbrella over your daughter surely means she is nice to/likes your daughter. If she genuinely despised her, and wasn’t professional about hiding it then surely she wouldn’t have given your daughter any coverage at all?!
Bizzare