My mum wants to take me formal shopping but I want to go with my friend?

My friend and I have already arranged to go formal dress shopping together to buy my dress (she doesn't go to school). I told my mum and she didn't react.

This morning she told me that she wanted to go formal dress shopping with me and she feels I like my friend better than her. Basically, she got mad with me for not asking her first to take me.

But honestly I want to go with my friend, I hardly ever see her and I was looking forward to buying my formal dress, also considering she can't go to my formal. I want her to feel involved with helping me pick out a dress. Yet my mum is acting upset now because she wants to take me.

Who should I go with?
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I'm paying for it
My mum wants to take me formal shopping but I want to go with my friend?
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