By the look of her face, she looks a little anemic. My guess would be worms. You said you just wormed them? Wait a bit to see if it helps, if not I'd try the Ivomectrian, it kills a lot of pests. Worm again in 7 days. Also check around her vent area for mites or for lice eggs clung to her feather shafts. Often when i bird gets weak these pest seek them out and pull them down faster since they are not as effective at grooming etc. when ill.
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