You can trim the feathers around her eyes but I’d try tying her crest up with a hair band. With all the feathers pulled in she’ll be able to see clearer and could help in making her head less of a target.
Unfortunately your RIR and hybrids are prone to bullying all chickens and they are known...
Bantams can usually hold their own but odd birds like Polish and Silkies are very susceptible to bullying. It’s generally advised not to keep singular odder looking chickens with more ‘normal’ chickens.
Please give some more info of your flock though. How many birds? How big is the coop/run...