Should I back out of the wedding party?
So I have a dilemma. My best friend (since 5th grade, and now we are all in our mid 20s), is getting married and has completely shifted personalities. Perhaps I should give a little background. I am recently married (February) and eloped to the Bahamas with my now husband to avoid the wedding craziness of both of our families. Since I got married, things have been distant since she still likes to go out and party etc and I have settled down with a career, buying a house, etc. She dated this guy, lets say Bob, for 7 months before going on a Caribbean cruise, the day before they left, she asked me to text him and tell him to propose to her. (Ackward, and I told her I wanted to stay out of it). While on the cruise she bought her own ring, gave it to him, and essentially propositioned him to propose on the cruise. Don't get me wrong, I am very happy for her since he makes her happy, I am just concerned since he told my now husband he is only with her for money (again,I am staying out of it,because my husband was not supposed to tell me). Any how- since engaged, she has gotten increidibly rude and mean towards me. We went to look for a dress for her which she found (looks beautiful) and afterwards went to grab dinner. While at dinner we talked about dance lessons (ballroom) and mentioned her and "Bob" going to lessons potentially. I offered my husband and I to go with her to the lessons (my hubby needs them!) so we could all go as a group. We also mentioned her planned wedding song which she was not certain of. She then blantantly states to me, "The wedding is all about me. It is my day and I do not care if you and (hubby) didn't have a song, its my day" Very much insinuating like I asked a favor? I corrected her and advised I was insulted by her insinuation. I also find out she was bad mouthing my husband and I's elopement (again, we ran off Valentines day weekend to the Bahamas by ourselves and loved every moment of it). As of now I am thuroughly disgusted by my "best friend" and at this point really don't want to be in the wedding, nor her friend. She did not even have the audacity to apologize (just said "whatever") which would have made things at least somewhat better.
My question is, the wedding is quite some time away, would it be a major no-no if I opted out of the wedding party?