You may have to "mom cat" her when she engages in the behavior. That is, give her a light "pop" on the head (as a mother cat does with her claws sheathed when one of her kittens does something outre).

Alternatively, or possibly in conjunction with giving her a "pauch" on the head, you may have to take her food from her when she gets aggressive with the other cats. Then, after a few minutes, love her a bit, put the food (or her) back down, and let her eat.

NOTE: This second alternative may require protective gloves when you do it the first few times.

She won't like it, but with such a reaction coming from the "boss cat," she will hopefully make the connection and realize that threatening her brothers and sisters over food that is readily available isn't necessary or desirable.

This worked for me with a cat I owned some years ago. Spot would get pretty aggressive at times--she was definitely an Alpha girl!--but a smart, one or two-fingered pop and a "no", would generally get her to settle. Then she'd come park her big carcass on my lap and purr at me like at lawn mower (at her heaviest, she weighed 21 pounds, was a foot tall at the shoulder, and was 32 inches long from head to tail).

I want to emphasize that you DO NOT have to make this any kind of a hurtful process... just one or two fingers when you do it, with the command, should do quite nicely. Your status as "mom cat"(She Who Feeds Us the Food) should cause her to react just as any kitten would, even though she's in a mostly-grown body now.

I think she just needs to know that, even if she is the alpha cat-cat, you are the Top Cat, and won't allow her to behave from her fears of scarcity.