If she acted like this before she was a future Mrs, I wouldn't throw her a party either. Nor would I "donate" to her cause. Parties for the wedding are a GIFT from WP members, friends, family (except immediate family), not a requirement. Thank your lucky stars that you got out of this one before it got this wacky. I wonder if any of her friends will still be around after the wedding.
"Love is not a matter of counting the years -- it's making the years count."