Tell her to trim it down first. If she tries to remove a full bush with a razor, she's gonna have no end of razor bumps, ingrowns, etc.... I wish I could tell you how to deal with this.... you could probably talk her through the process, showing her on underarm or something, but she's going to have to do her own razor work, I think. Just don't explain the process from the perspective of someone that has been shaving for a long time....it has to be done with the first time point of view. Going with the direction of hair growth, don't take more than on or two strokes on any point, let warm water saturate the hairs before applying cream/gel/lotion, etc... You should be ok with that.
Out for life, liberty, and the pursuit of cuntishness!
"...So I told the swamp donkey to sock it before I gave her a trunkey in her tradesmens entrance and made her suck me yard balls!"