Should I gift my sister for her wedding?

I got married a year before my sister, she refused to be my bridesmaid and didn’t gift me anything. That’s okay but now she is getting married, I am fine to be her briadmaid but she complains to mum that I didn’t gift her anything. Mum told me that it’s immature to not gift her, but she didn’t gift me so why should I? I paid for my bridesmaids dress, which is already more than what she did for me!

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