my friend was angry for I hadn't attended her wedding

What is your reason that you weren't able to attend her wedding? Have you inform her earlier that you can't really make it? Maybe she is already expecting you to be there and think of it that she invited you because you are one of her important guest that is suppose to be there therefore you must understand her.

Your friend is angry with you. it is quite natural. Everybody wants presence of their friends on the occassions like weddings. Try to explain the circumstances prevented you to attend the wedding. I hope your friend must understand.

GUess it would be best if you approach her and apologize to her but invite her to a dinner or anything for both of you to have bondings together.

send her an email, or corner her in the parking lot, if your closer and you have keys to her house or apartment, go there and make her something to eat/bring her something to eat if your not a good cook...I actually did the things I suggested to you ...I'll assume that your explanation is valid, she would understand in the end but you really have to put a lot of effort since a wedding is also a really very important occasion to be missing... hope it will all work out!!!

hello, You just understand her because it is her special day, that is why it is very important to her. It is really hard to explain for now because it is still fresh let her think first and make sure when the time comes that she is ready you need to be sincere apologizing. Just don't give up. good luck