The going rate at my LQS is $26 per hour after a certification class ( which is $175). You also need to purchase your own leaders. Customer must also purchase batting.
How well do you know this person? Do you trust her with your machine, and access to your home? How much time do you want to spend with her? These are all considerations you'll need to decide. I have a very good friend who allows me to use her long arm (totally computerized.) for a very nominal fee. The key is that we enjoy spending time together and consider it a 'play day'. She talks of letting me use it when she's out of town, or busy elsewhere, but I'm just not comfortable being in her home when she's not there.