User account deletion

At the school I'm at, we don't keep our students' user accounts on Mac OS X between years. As the school year's about to start, I went to delete them all. I deleted everyone between A-Mr. and from Ms.-Z. I forgot about our one Dr. on staff. Fortunately, she's on Mat leave, and is using her work computer at home, so I don't need it recreated RIGHT THIS SECOND, but the sooner the better. We back up with Time Machine. It seems to work beautifully. However, I noticed that unlike other Apple software, you can't just use Time Machine in that application. Sigh! How does one recover the user account? And now for the obligatory smashing my head against a desk yelling "stupid!"