If you want to save all the fry than the best thing is to set up the new tank and make it ready and move the female at any time.
She may spit in the net, which is no big deal, or she may hold on longer. Either way no worries, put her or her and the fry into the tank. Feed the female a bit and get her some weight back and then remove her. You can feed the fry finely crushed flakes or pellets that the adults eat, they are old enough for it by the time they are spit.
you really don't need to strip, there is no reason to put the fish through it. I have never had to strip a fish even when I went through my 'I want to breed' phase (before I realized how ridiculously easy it was). Let her spit naturally, strip only if there is a problem - why force her if she is not ready - she can go the full term, is physically designed to.
Personally I like to let them spit in the main tank and celebrate the survivors - they're too easy to breed to get money for and it's really cool when a couple of fry survive and join the adults on their own, way cooler than just raising a bunch in a tank and giving them away.