I had the same thought. What you quoted, kaj3, shows what a special friend Princess_Abby is to this lady.
Abby, if you feel that this guy will ditch the wedding at the last minute, then maybe you should tell her how you feel about it. You don’t have to make it “advice” but just sharing your heart-felt feelings about the whole situation. Sharing it with her out of love, just to let her know how you see it. She is then free to make her own choices, but knows how her best friend feels, too.
Maybe it would be good to get together with her in person, if she lives close enough.