Should I ask her to be part of my wedding? Help please!?

Sit down and write her a letter, say how you feel and how upset you are over the loss of such and important person in your life. Tell her that it was such a silly thing to fall out over and how sorry you are. Mention that you are getting married and that you want her to be part of your day. She may feel embarred when she sees you, but will read the letter. If you don't hear from her, it will be a great shame but at least you have tried to rectify the situation.