'98 Maibu drove through water

A woman I know drove her '98 Malibu into deep water almost up to the door handles after a flash flood here. I told her I'd post what she told me here and see if anyone has any ideas. The car actually kept running as she drove through the water, and she parked it and went to work, came out later and it wouldn't start. After cranking it for quite awhile it actually did, start but didn't run like it did before. A week later, it no longer runs, just cranks but doesn't fire. And now, when turning the ignition key to the on or start position, nothing on the dash comes on at all, no indicator lights of any kind, no odometer, gauges don't move. The radio still plays and headlights, wipers still work. As far as it not starting, I would have thought the crank sensor connection would be the likely culprit due to having been under water, hence no firing nor smell of fuel when cranking... But the instrument cluster being dead now might point to something else as the cause. I suppose it's possible the ignition switch just co-incidentally happened to fail right at the same time -- which I have read they are known to do on an Olds Intrigue of the same year, and they appear to be the same switch. She has a bunch of junk hanging on the keyring with her keys, which I have heard can cause problems with the switch. For now the car is just parked in front of their house. She actually just wanted to junk it but her boyfriend thinks that would be a waste, as it's an otherwise decent car, reasonably clean, decent looking, and probably had a lot of life left in it otherwise. I do not want to get involved in messing with it because I think a flooded car can end up with all kinds of glitches, now and in the future. Glad it's not my problem. I told him if someone offered to sell me a car like that -- but it didn't run and had been flooded like that, even for a couple hundred bucks, I'd turn it down. Engine is a 3100, unknown miles. Anyway, I told him I'd post it on here for the hell of it and see if anyone had any suggestions as to why the thing won't start, as well as the dash being dead like that. TIA..