Mummy who work how much do you really earn ? And how often do you work ?

I'm a full time working mom earning $5.5K per month and for year end bonus, I get around $15K. But I worked like 12 to 15 hours per day including weekends. Till the point that I overlooked the need to help my kid in her studies to the extent that she is failing in alot of her subjects. So I dunno whether the paycheck is even worth it or not. I admit that I am guilty of being overly ambitious to climb the corporate ladder. Knowing exactly that my child will only grow up once but at the same time, my opportunities at work may only come once as well. Usually I am very decisive but in this aspect, I am really at a dilemma...