I helped a friend in another market get started and it was just a headache. She didn't really have the mindset to be an independent contractor and couldn't truly commit to the jobs time-wise. She got frustrated at me when it came to searching for jobs. Overall, it was a small nightmare.
She would continually say how "lucky" I was when it came to landing good jobs but didn't really understand that it was a lot of work searching for jobs, scheduling them, tracking them and the associated mileage and payment. Of course there's a small element of luck but work created most of my "luck."
I have other friends and family who have expressed interest, also in different areas, and I have written up tons of info and none of them have acted on it.
I think most people have the view of mystery shopping like the romantic way it's portrayed - eat for free, shop for free, etc. and don't understand the work involved in it.
All of that to say - I agree with throwing the friend a bone with a company that you don't work much with and see if they go anywhere with it. And as others have said, you likely didn't have anyone helping you, I know I didn't. It's the kind of thing you need to be a bit of a self starter on. If one doesn't have that characteristic, they probably won't make it anyway.