To ban trip to Santa Claus

[Idontneedanotherhero]

DD is 5, has been behaving terribly since half term. In reception - behaved fine for the first few weeks, terrible since after (coincidental with the flu vaccination she had on the first Monday after - I tried to blame that for 2 weeks but no). Genuinely terrible, tantrumS, can't take her anywhere as she kicks off, little brother has started copying her, she starts to scream and shout and tantrum like a two year old. "I hate you. You hate me, nobody loves me etc etc". Stamping feet and so on. I've tried calmly reasoning and sadly I've shouted on a couple of occasions. I don't believe in threatening things you won't go through with but tonight she was so awful I said we would not be going to Father Christmas tomorrow. Unfortunately there is her little brother and her friend involved in the trip. Arghhh. What do i do? AIBU to spoil the trip for them all?

The OP is asking for advice, not a poll for whether you think she loves her daughter or not! Also, if you bothered to read my post, you would see that I did not insinuate (or otherwise) that the opp doesn't love her daughter. I was pointing out how taking a child to see santa, and leaving one out would be perceived by the child as that they aren't as important as their siblings and also reinforces the idea that no one loves them. Especially as the poor love was saying that
"you hate me" to her mum. And I know how it gets twisted in their little minds, because I was that child who was excluded.