I'm with the others on the naked time! It's so good to let them air out. You can lay her on a blanket, if it's not warm enough to be bare you can lay a blanket over here. Just not having the diaper clinging to her will help. I don't know what kind of diapers and wipes you use, but most are full of chemicals that could also be the irritating her. You may want to try another brand. I used Seventh Generation diapers when Nathan was first born and I loved them. I've since gone to cloth diapers and I love them even more than I ever thought I would. I still use the Seventh Generation wipes and I doubt I'll ever use anything else. Nathan's never had a diaper rash and while I can't say for certain that these things had any thing to do with it, it certainly didn't hurt any.

Good luck with Delilah, I hope her bottom is all better really soon.