As Easter3 says, I met up with her husband Monte today, and we had a productive diagnostic session. I am happy to report that her motor, controller, wiring harness, and charger all appear to be ok. Everything worked as expected when we hooked the bike to one of my batteries. Unfortunately all four(!) of her hub batteries seem to be self-discharged. We hooked up the charger to one of the hubs, and while it took a charge, it rapidly lost the charge as soon as we disconnected the charger. I don't think it could hold a charge as long as 5 minutes.
While we were waiting for the charger to do its thing, we took apart one of the other hubs and measured voltages of each cell. Most were in the neighborhood of 0.02V, one was 0.001V, and one had a reversed polarity (I forget the voltage).
So, here is the question we have for those with a better understanding of batteries than me: The hub had 4 packs out of the 6 in which all of the cells had at least 0.02V present. Assuming that this pattern is the same for the other 3 hubs, it is probable that there are enough packs with all positive cells to put together a hub that may take and hold a charge. Is this reasonable? Easter would have to accept that there probably has been some damage to the cells, and they will never perform as new, but the bike should nonetheless be quite usable. Or, once one of the cells has flipped, has it ruined the whole set of 30? My recommendation to Monte was that he open all of the hubs and check the individual cells before he tries to hot-wire charge any of the others. It is not clear to me if one could cause more damage by charging a hub with a flipped cell.
Also, as a follow-up to the problem Monte mentioned with his controller not coming on, even when the battery is being charged, apparently this is normal behavior when the battery is badly discharged. We were able to replicate it with my controller.