Can I add my sister as a second maid of honour after my friend has done the planning?

My friend saw "joint maids of honour" on the programme draft and asked whether I'd meant to send her a different version. I hadn't told her I was thinking of adding my sister.

I asked my friend a year ago. She's organised the shower and been the person I call about the wedding. My sister and I were barely speaking then. We've become close again over the last few months, and I'd love to acknowledge that at the ceremony.

My friend says she isn't trying to own a title. She wishes I'd spoken to her before putting a changed one in a document. I agree. I also don't want to ask for permission to include my sister in my wedding.

How do I repair the way I handled it while deciding whether this is actually the role I want my sister to have? I may have reached for a familiar title before thinking about what either person would do.