Well, under civil law, the corporation is responsible. There's little point suing the manager individually. People who are discriminated against sue corporations in order to extract meaningful damages and provide strong incentive for corporations to obey the law.

Yes, The manager committed the act of discrimination, but she did it for the corporation. So the corporation is liable. If they're found guilty, they're going to have to pay up. In future, considering that, they will likely work very hard to train their managers to understand the law and obey the law.