It sounds like it's getting worse - (again, I don't have experience with this, so I may be just talking nonsense) but if I were you, I'd prevent any 'attacking' from happening immediately. Otherwise, you may be heading deeper into troubled waters...things can always get worse and you probably don't wanna go there!
Maybe try to feed separately again? Somehow entice them to eat separately - feed them/put Parmesan cheese/add a topper etc...
I'd keep them separate at all times when you're not around and then limit their exposure to each other for now. When they are in each other's presence, I'd do daily training sessions with them, and then separate as soon as you're done. And then do training sessions with them separately, if you have time. And then, any indication of even starting to show aggression, separate them and end the 'fun training sessions'. And...when I say daily training sessions, it could be just repeating stuff they already know and getting treats for it - it's supposed to be fun for them, kind of like a daily refresher, or you can try to teach them new things.
That's what I would do anyway. And I'd do that for some time as a new routine so that they know you're the boss, you're the one in control, and you tolerate no aggressive behaviours. And then slowly increase their time together again, as long as they're behaving. The poor girl being attacked needs to be reassured she's safe. The one doing the attacking needs to learn that it's totally not acceptable.
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