What shoudl I do about my mother?

I am in the midst of planning my wedding and our 6 month countdown is May 8, 2008. My mom has about 5-10 people that she would like to invite. I have been asking her for their addresses ever since January. It is now May and I have yet to receive them. I have so many other tasks on my plate and I don't think that it is my resposiblity to keep requesting these addresses from her. Quite frankly I am getting very frustrated and am really close to cutting her people off of the guest list, my fiancee and I are paying for the WHOLE wedding. I really need help! Thanks in advance!