I have a dear Lutheran friend who mentioned several years ago how much she dislikes the Catholic church because of propaganda she had heard, things that happened in medieval time (absolution in exchange for donations to the church), and misdeeds of priests. About a year ago, before I was engaged, friend was dating a Catholic guy (not anymore), whose religious mother mentioned how friend and her son, would have to get married in a Catholic church if/when the day came. Friend was appalled and ranted about it to me more than once.
Because of this I generally try to avoid talking about Catholicism around her and just opt for the be a good person, lead by example route. She genuinely is a good person.
I haven't formally asked her to be a BM yet, but I want her to be one and she would be hurt if she wasn't. FI and I are both Catholic and having a nuptial mass at our wedding, which will be at least an hour long and friend will probably be either thinking about wanting to roll her eyes or actually rolling her eyes at a lot of the parts of the mass.
My question is, should I have a frank conversation with her about how she is important to me (where I can carefully plan what I'm going to say), but how I don't want to hear a word about her disapproval? OR should I wait for her to do something else that indicates her disapproval and broach the subject then?