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I would say that a credit is for one (or short time) use and if she was going to use it for mugs, t shirts etc. I think you are moving in to royalty territory which you could waive by upping your initial pricing.
A lot of it depends on how important it is for you.
You could be famous one day and these early shots could be a goldmine for her with her mugs and t shirts. Ok, that's taking it to extremes, but I hope you get my point.
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