I agree with liquidlight also. Talk her through it. That way you both get what you need. She gets her fan installed, and you get to ensure that it gets done without paying someone and she learns that she doesn't get out of the work when you help.
Furthermore, I'd suggest you make this the common method of doing things--require the presense and participation of the person for whom the work is being done.
It's a fairly basic teaching technique. The person helping is hands off the actual work unless absolutely necessary to demonstrate a technique.
Gilda
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