I definitely thought of the cabbage leaves, as they are magnificent for weaning and engorgement in humans!!
But then I thought, how the heck will she gets them on the cat? We can put them in a bra. So I left that out. But if the cat is lying down maybe.
I think warm compresses and some gently “milking” just to the point where the kittens can suckle.
Ha ha. My sister’s male Schnauzer has seizures so wears a velcro diaper around his belly (not his tail). It’s wraps around his belly/back, holding a pad against his “belly.” They sell them at Petsmart. Maybe the cat could wear shredded cabbage leaves in an elastic bandage for 30 minutes, safety-penned at the back? She would hate it, of course, but it might be just the thing, would work like a cat bra (did I just say that?) and the support alone might ease her a little. : D