I'd just call a local printing company I use, find out what the minimum order is, find out how much it's going to cost, and then give the model a quote (along with something for my time and work to prepare the images, etc).
Either the model accepts it, which in case, get a deposit, or they don't.
The revenue sharing is fine, in theory, but how many will she sell, realistically? Will she even be able to cover the costs? The amount you'd get from it in a profit share is so little, you're better off just pricing up the job and giving her a quote.