I disagree with the people who say to refuse. That is no way to treat a friend in need.
If it is going to be a big, fancy wedding, and your friend is a Bride-zilla and just trying to be cheap with photography, then yes, tell them no. But if she is just not rich and just wants pix or snapshots to commemorate the occasion, then by all means, go ahead!
It's not a big fancy wedding. Just some family and a few friends. I have told her not to expect perfection from me since this is my first wedding and suggested that she gets someone else with more experience but she insisted on me doing it and as a favor to her and my wedding gift to her I am doing it. If it was a big wedding I def would have refused. She is on a tight budget (so tight that she borrowed a wedding dress). I know I don't have the best camera but it's a good start for me. Thank you for your suggestion and not being negative. I was actually thinking about purchasing the 50mm. It's good and non expensive. Again I would like to thank you for your help!