My MOH is out of my wedding!!!

Well, I picked one of my closest friends to be my MOH, and I was so excited to have her in my wedding...As my shower was being planned she started to completely exclude my Bridesmaids from all the planning and 'told' them what she was doing. She wasn't including anyone else, in fact she told my younger cousins (jr BMs) that they can come 10 minutes before the shower, just in case SHE wants them to do something...they were devastated. They wanted to help out so badly. My mom started to ask me questions and hinting around (my mom and I know each other so well, so I knew something was bugging her) about my MOH giving her trouble. When I asked her what she was doing, she ended up telling me that everything my mom suggested, my MOH would shoot down. My mom is paying for the entire shower, and my MOH was nothing short of nasty and condescending to my mom. When my mother said she wanted to get additional favors (aside from the 2 pretzels the MOH planned to give everyone!!!!!), she said that she 'does 3-5 showers per year, so she knows what she is talking about' and if my mom feels it is necessary to get more favors, than whatever...
Now for the best part of this...my mom explained to her that she did not appreciate the tones in her e-mails, this shower is for me and my happiness, it's not about anyone else. She completely made this about her, she ignored the pleas from the other girls to get involved and help plan. No one wanted to involve me and get me upset, but she just took everything way too far!!!!!!!!!
She ended up writing me an e-mail-YES, THAT IS RIGHT, THE MOH DROPPED OUT OF THE WEDDING THROUGH AN E-MAIL!!!!!!!! And at first, she started to blame it on money, saying she has a lot of bills to pay(she lives at home and is planning a summer vacation to Greece!!), and she will not go into debt for anyone (meaning me)...and then she said that she was just too uncomfortable around my mom, and feels disrespected. She says that she refuses to be humiliated! Again, this is not about her!!! She then told me that she comes first in her life, before anyone she is close with. Now for the kicker of her e-mail....IF I can move past this in the future maybe we can remain in contact. WHAT THE F???????!!!!!!!!?????? I know that I am forgetting something horrible that she said or did, I am just so mad!!! I ended up asking another girl in the BP to be my MOH, and she is awesome! She should have been my first choice...The girls are so excited that the old MOH is out and my new MOH is in! I just cannot believe the nerve of some people!! Sorry for the long vent girls!!!!!!!!!