Being quite new to africans, I`m struggling with a female lab who held for ages until I eventually intervened, but she is so wasted I don't know if she is going to survive.
It seems that some inexperienced mothers will hold for longer than is nesc. and in doing so risk their own health. I don`t have enough experience to advise you, but I was very suprised by that individual's behavior.
Whatever you do, keep an eye on the mother's health, especially if it's not bred before.
All other females so far, I`ve stripped at around 3 weeks and they have been absolutely fine when returned to the main tank.