Concentrate on the larger businesses/employers who already have staff rather than small shops etc that may not. The reason being that the schools usually want a whole host of paperwork about the workplace, such as insurance documents, H&S evaluations, DDA evaluations, employee handbooks, water safety and asbestos inspection reports, etc. The smallest businesses may not have these, so even if she finds a placement in a local shop, the school may veto it if they won't jump through the required hoops to provide the paperwork, policies and statements the school needs to tick their boxes!
I know this from bitter experience. A local school teacher contacted me to ask if I'd provide work experience placements, which I readily agreed to do. Everyone was happy, student lined up to come, but then the school's administrators sent the paperwork for me to complete - literally dozens of pages thick which would have taken hours to do. I phoned them to ask how much of it was necessary, such as the DDA evaluation and asbestos survey, which I simply didn't have, and they told me it was essential and that I wouldn't be able to proceed without the full form being completed with copies of all relevant documents required. When I phoned the teacher to say I couldn't do it, she was livid with their administrators!
A larger business that already has staff, would (should) have all the paperwork in place and if they have admin staff themselves, filling in such a horrendous form is at least delegated rather the the business owner having to do it!