Forced Resignation because of being a solo parent

Okay so here is the situation. My girlfriend and I had a daughter right after college. We didn;t get married because we don't think it is the right time yet. The child is under my last name.

She applied in one of the big banks and got hired. We didn't declare our baby because of what discrimination she would face and the chances of her getting hired would be low if we would declare our child. 6 months probationary period before reularization. Around a month after her hiring date, a chismosa co-worker blurted out to the manager that she has a child. She was then forced by her whole branch that she should tell the HR or they would not let her do any work at all and that they wouldn't sign her regularization in the future. She confessed to the HR because of the pressure from her branch. HR then told her to resign or she will get terminated. She was forced by HR to sign the resignation papers (that the HR manager typed out for her). Is this all legal? Is that really a huge problem that she didn't declare her child? Is that enough of a reason for her to be forced to resign or to be even terminated? Where would RA 8972 fit here?

Thank you.

Does the application form ask if have child, so she lied when she wrote it?
That can be a reason to fire her, because of apply with false information.

If the form didn't ask that, then I don't know what Philippine law say about that.

While it is not proper (strictly speaking) to ask someone to resign, if it is true that your partner did not declare her actual circumstances then that would be grounds for non-regularization for providing false information or misrepresentation.

Most applications have at the bottom something like "All the above details are correct to my knowledge and if any misrepresentation is found in the future, I may be liable for falsification and my employment may be terminated."