so since the day i got engaged my sister has been excited for me but not willing to follow through with anything i've asked her to do. the rest of my bridesmaids have been very supportive, have already purchased their dress and shoes and even airplane tickets if necessary. everyone in our families has been supportive as well.....except my sister. she lives 2000 miles away and still hasn't bought her dress, shoes or plane tickets after multiple attempts. i've given her websites for dresses and the shoes to buy, offered financial help with the items, and even gave her a deadline after everyone else to ensure she'd get them. AND SHE STILL HASN'T. i'm very sad, disappointed and feel like my sister is someone i can't rely on anymore. should i ask her to not be a bridesmaid anymore?? or am i being a b-i-t-c-h?