Are you wanting to save a large number of fry or willing to let nature do the thing?
For the largest number, get a second tank or use your QT. A ten is fine. Don't worry about the cycle, she won't be there long and the load is very small when you don't feed her. She won't eat anyway so keep the water clean and wait. When she is ready or you feel the time is right, move her to the smaller tank. Don't add any substrate, just paint the bottom outside black to avoid fish confusion when they try to swim down. Keep lots of rocks in the tank and let her have some that are big enough for her to hide. The sooner she feels safe, the sooner she will release them if you have timed it correctly. She will not eat the fry when you are catching and moving her. Peak in occasionally to see that she is still bulging at the jaws. When she is not or she comes out, look for fry and move her back. African cichlid mouthbrooders are among the easiest fish to get a tub of fry due to letting them do the work. The fry will begin to take fine crusted food immediately and that is about all you have to do. Good to have the fry tank filled with water from the main tank when you move her.
If you want to let nature do it, make stacks of flat rocks where fry can squeeze in between the layers to avoid being sucked out. Some may survive depending on how their genes tell them to hide ----or not.
I now see the pics. Don't be too quick to move her. Two weeks seems a bit quick to me. Her mouth will reach a point where it doesn't close and you can look in and see the fry. Then is about time but watch for her to get really nervous and possibly go u[p and down the corners as if looking for a safe spot.