did she recently go through a car wash/heavy rain?
happened to my car too - turns out there was a recall on these cars where the drainage holes under the windshield get clogged and the water overflows the ECU compartment.
It cost me a new computer.
1992 BMW 325i (CHUMPCAR #296 - build in progress)
1992 3.0L M52 325i (ex-daily driver - track car only)
2002 330Ci (ex-daily driver - sold!)
Check out my e36 track car build