She definitely should give alot. Morgan Freeman! He could be a great spokesman for this (per CNN article).
I'd say if they already have a show together for Friday that that was FAST. These guys are great. Everyone loved New Orleans, and so many will give. I would only bash the ones who dont give (Britney, don't you want donate some of your pretty baby clothes, aw, you can get new ones....).
Everyone is still just kind of thinking what to do. The real tragedy has been our UN-rapid response. There are lives to save, messes to clean up, people hungry. The money won't help the damage already done but it will help rebuild eventually and feed the refugees.