LifeTouch contacted me via e-mail this morning. It sounds like "C" is in luck, if her school actually used LifeTouch as their school photographers. (Most do, with the exception of Senior Pictures) Of course I have no way of knowing where she even went to school.
http://schoolportraits.lifetouch.com/
Click on reorder info. and then a link for "local Lifetouch office". Enter state, and city, and you will receive the local regional office for the area. She needs to contact the local office for her school to receive reprints.
The reply I received didn't say exactly how long information is kept, but it seemed to indicate that portraits from the 70's would be obtainable. I realize "C" does not have a computer, but if one of you who talk to her could get her the info, she should be able to show you what she looked like in 1st grade by next week.