I'm going to back out of my friends wedding party
Why don't you want to attend your friend's wedding party?
Because she divorced someone on the second day of their marriage.
I can understand how you think your friend is not suitable for marriage. This is her day though, so you shouldn't back out of her wedding. This might be better than the last one and you don't know the circumstances of her last marriage.
I'm going to just get away from the party.
You made a commitment to be at your friend's wedding. You need to follow through regardless of how you feel about her marriage. You need to support her.