I along with many Thai's consider the Bt 100/200 here and there as harmless, but outright corruption is not really accepted, not that the average person can do anything about it.
Get a marriage visa with multi-entry stamp, that's the easiest -, you just have to time a visit each year to coincide with the expiry date and compile with the requirements for renewal.
Immigration police are the same as the "oridinary" police - so assume they have every right to check but normally wouldn't bother as there is no point unless someone has been flagged for visa violation.
what will happen, absolutely nothing - other than Charlene An will be blacklisted as it was a mis-understanding and she should accept that and forgive.