How long is her child going to be in full-time nursery, though?
If that poster is actually considering this and not just rage-baiting, she is lacking in common sense. Firstly, she will lose her workplace pension contributions and career progression. Secondly, the job market is dire right now and only likely to get worse. The chance of her getting back into her career at the same level, on the same pay after a 3-year break is slim to none. If she goes ahead, she is setting herself up for either a life of poverty or a long, hard slog to climb back up the ladder.