you need a faster lens and one with IS. 70-200/2.8 or 24-70/2.8 are good solid lenses that still offer some flexibility in range (later on you might want a fixed 50 and 85). You have got to get rid of the grainy pics! The composition is largely better than the last batch we evaluated. Looks like she needs to get real handy with manual settings on the camera, as well as quickly changing focus point. If you set your focus point to the center, you'll want to zoom out some on pics so you can crop appropriately later; you don't want every last one to be focus center...remember rule of 3rds. Overall, I'd say her improvement is excellent, but these still aren't sale-able prints yet. MUCH closer however. Also, take note of some of the pics with heavy shadow behind the couple due to the flash. With the 2.8 lenses she won't have to rely on the flash much or at all. If a flash is needed, try oh try to get off camera flash rather than on camera for this reason.
Thanks Val. VERY useful input. This batch was done with a 24-105mm but I bought a non-IS 70-200 F2.8 last week and used it this past weekend. This weekend's batch had a lot more problems with shake than I expected. She also paid attention to her white balance this week (AV mode), so I think they should come out more consistent than the week before (full auto). We had to do a bunch of WB edits and that's probably why they so all over the place. I really do appreciate you guys chiming in on this. I know it's not DJ-related but perhaps somebody might find it useful down the road in their biz evolution. IF we can pull off this photog thing, I'm hopeful it will give me the option of going FT in the next few years.