This is my opinion of course, you/her may think differently. If I were you, I wouldn't charge her a dime - more so I'd take it as a learning experience. People have asked me to train their dogs and when they've offered payment I've refused. Simply because I am not a professional. I've just enjoyed the fact that I've been able to work with another dog
i agree. i train dogs for people here. i'm currently housebreaking and basic training my grandmothers shih tzu puppy. she pays me about $20 a week. she offers to pay me more, but grandpa fixed my car so i won't take all the money they offer me.

to answer the origonal question. i would pay anywhere between $5- $7 for a good newer trainer.