How about a sea salt shower scrub? Mix coarse-ish sea salt with olive oil to make a fairly thick consistency, add a citrus oil like grapefruit or lemon (good for cellulite, making skin look fresh), perhaps about 100 drops per 100ml of olive oil you use, go by smell, as she's washing it off almost immediately, nothing is going to be absorbed into her body.
Make it in a big glass jar - it's so cheap and she'll get through loads really easily.
Make it in a big glass jar - it's so cheap and she'll get through loads really easily.