Eclipse is gorgeous.
I have 4 male cats and 2 of them love to eat and were becoming too heavy. Now I feed them 1/4 cup of dry food 2 times a day. They hated the routine at first but have now gotten used to it. I feed 3 of them a mixture of Nutro Complete Care Weight Management Formula and Nutro Max Cat Lite. My Cirrus is on special food and gets Hills Prescription c/d diet. So far they've been able to maintain their weight and Cirrus lost a pound.

I'd switch her food to another brand of lite formula and feed her several small meals a day. Since you live in Canada, I don't know what brands are available to you. Good luck and please keep us updated.