I would also add - it is always better to have a planted plant already growing in a pot, than cut off the branches of the plant. I have observed that the butterfly "feels" this difference and may reluctantly lay eggs.

It is good to put a lamp above the cage - light and HEAT (at least 2-3 hours) will provoke the female to lay eggs. You have to feed the female. As Adam wrote - the leaves must touch the top side of the cage, they can be bent on the entire top side. Put something under the glasses of water. I would a...