Hello there I can see the problem, it’s a calcium deficiency. Might give her little magnesium as well. So would recommend adding CalMag to your feeding, CalMag also works as a foliage, you can spray it on the damaged leaves to prevent more rust to come. But the rusty leaves won’t be green again.
But will prevent more to come and the stress she is feeling to go away.
Good luck my friend and may the buds be with you 😁🤩