Have a question - Maternity leave and bonusses

[Jacques#1]

Hi

This may have come up, but I figured I'd just ask again for someones input.

My wife is on maternity leave....

1. Would a letter of resignation a month before she returns from maternity leave (completely unpaid - legal but rubbish after long, loyal service) to allow the "calendar month" be legal/ethical (don't give me that look, her employer has never cared about any of the employees, she's put in more work than most of the people there for the better halve of a decade, works lunch times, always on time, always last to leave and still they just don't care about growth within the company......long story)

2. If the rest of the company gets bonusses, surely she must also be entitled to get a bonus, for work completed up to her 1st day of leave? Am I right? If this was not to happen (which I have a strong suspicion may be the case) what would be my approach to management, and knowing their arrogance eventually the CCMA?