the cage they are all put in should be a neutral cage completely clean of all scent. once you put them in a scented cage the territorial instincts may kick in and sounds like Hua wants to defend her homeland.
You say Hua attacks ONCE. We adopted a 2 and 1 from a friend, they had tried introductions but the female of the 2 always chased around the female 1. We put cages together and they seemed fine, we put in bathtub and they were great. we put in NEUTRAL cage and they slept together great, then at night the female of the 2 "sweet pea" gave a small short chase to jasmine if she got in her face. happened ONCE a night maybe. NO fight and sweet pea never caught jasmine. so we let them stay together. after about one month the short chase stopped. If I feed them dried mealworms jasmine sits away and will sometime be protective of her area during this time. other then that they are great together.
ps once you put them in cage together, if they dont FIGHT its best to leave them together. We do introductions in morning hours so they will sniff, then fall to sleep together.