Why would she want to go to weddings and even be in them (including maid of honor for her sister), if she doesn't want to get married herself?

The girl i like, who likes me back, we've admitted to each other than we don't want marriage or kids. At least I'm telling the truth, i know that for sure, since only i know my own truth, so, question is, is she.

Her sister is getting married, the wedding is next year, late. She's gonna be the maid of honor of course, since it's her sister. If she doesn't want to marry herself, why does she want to be involved in other peoples weddings. She could have certainly said no

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She has already been married once. She married a guy for his money. It was horrible. She left
Why would she want to go to weddings and even be in them (including maid of honor for her sister), if she doesn't want to get married herself?
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