Joanna was a major B**** who wasn't sorry!
She gave Marni a necklace with "Moo" on it.
She could have given her a diamond from Tiffany's but that necklace was horrible. she didn't even put it in a box and hide it from people.
She only apologised when Marni got the better of her at the meal and when she thought the wedding was off.
It would have been a better ending if Marni's brother found out what Joanna was like and then broke up with her.
It's typical of people like Joanna to say to Marni "That was high school" as if oh it was years ago why make a big deal about it now.