For one of my friends weddings that's upcoming, I'm a backup bridesmaid for my crush if she can't make it, she asked if I wanted her dress?

I'm pretty sure she was joking around, but she still sounded serious and I'm not sure if I should take her up on her offer
For one of my friends weddings that's upcoming, I'm a backup bridesmaid for my crush if she can't make it, she asked if I wanted her dress?
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