I replied to the parent comment above, but it's worth replying to this. The kids might not know what mom did before this, but the way the mother operates was long ago normalized for them. The mother probably never lied-- they usually don't-- she probably just never shared. What the mother does is a job that isn't necessarily in conflict with her love for her children. People have to balance the effort they put into their job (as opposed to the effort they put into their children) all the time. She still gets to make that choice, at least in the US and the UK (as is the case here). That choice may cost her her job, but that's true of any job.

This is all to say, it's highly doubtful that this had the impact to their relationship that you're imagining here.