Megan - in the newer templates there is actually a slider to adjust the blog width in the "Template Designer" section. I have a lesson I teach about customizing blogger so if you can't find it right away I will try and pull up the lessons with screen shots for you.
If she has an older template I think I might still have my old lesson too. Give me a few minutes and I'll see if I can find the lessons. (I'm making dinner now too so I'm a bit interrupted....)
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