Yep, start a scrog net at about 20cm. To keep it at that 60cm you want, you will likely have to supercrop and top a few times also. It won't be the prettiest scrog, but it should work. Your other option is flipping to flower in week 2 or 3. I don't recommend this because she will not want to flower that early and your yield will be minuscule, but again its possible.