You can liquify the baby food or Nutrical by adding a bit of water to make it easier to feed to the cat in a feeding syringe. Those are made especially to feed baby birds, sick cats & dogs, etc. They don't have a needle or rubber gasket and are made, unlike injection syringes, to use over and over again. You can get feeding syringes at pet supply places like DrsFosterSmith.com. With respect to urgent need, you could use whatever syringe your vet can give you until this would arrive.
But the first ingredient is corn syrup. She has diabetes. So I don’t think it would work.