The most obvious thing is that there's 0 permission slip going on here. I've done career-day type situations, and every single time, I needed paperwork: The place in question was contacted to make sure they were okay with it, and they had to sign that I spent the entire time in the company of adults.
Sam is very much in trouble here. But I can see her dad turning this into a good thing: If running off is a bad habit of Sam, Jim can either
A. Hold this over her head: If she ever runs away again, she's not allowed to visit the shop again.
B. Make her work for Fey/Bubbles as 'punishment'. As soon as this becomes work rather than play, Sam's gonna balk and try and avoid it, but at the same time, she's going to want to be around Fey . This is a pretty effective way to teach her responsibility, and how to commit to a long term goal and sense of responsibility and organization. It would also be a good way to mature Fey and Bubbles in their own ways, having the little monster under their wing on a regular schedule. So everyone wings: Jim has some much needed leverage, as well as knowing there's someone outside the home to keep an eye on Sam, Sam gets a bit of consistency and structure, and learns a really useful trade, and Fey/Bubbles both get to mature a little, and bond over looking over an adolescent.