Have you read any threads regarding this subject...? (there's one in my signature, if interested)
1. Why a bigger pot?
2. Foliar spraying too often can cause mold issues, and restrict her ability to respirate and heal.

Did you at least flush when you moved her (them) to 24/0?

Leaving too much bud material and leaves, (in my opinion) keeps the flowering hormones on-board, and causes her delays in reverting back to veg.
Old growth often dies, as the power to re-veg is in the stem and roots, not the old foliage. The only thing the old foliage is needed for, is an additional boost of food and energy prior to the new growth showing and taking over.

If you stop now, failure is guranteed. If you keep trying to pull it through, you gurantee yourself a chance for success and the knowledge that comes with it.