My sister refuses to wear her bridesmaid dress
Hi everyone, I am so upset and just looking for a sounding board here. My sister who is older than me by 12 years refuses to wear the bridesmaid dresses I picked out- all this 20 days before the wedding. It really crushes me. I haven't asked her to do anything else for the wedding except walk down aisle with this dress on and she just refuses because she doesn't like the dress and doesn't feel comfortable in it. I understand that it may not be the dress she picked out and I told her she could go to the tailor and fix it up to her prefrence, wear it only for the ceremony and then change or find a dress in the exact matching colour (its a very particular baby/light blue so it would be a challenge but I gave her the option). She originally told me she would go to a tailor but just today when I checked up on her she said sorry, tailoring it won't help I'm not wearing it.
What should I do? Also as a side note is it bad for a wedding party not to have equal parts groomsmen and bridesmaids?
-An upset bride-to-be