Well, she can see when the other hens react to the call and start running for cover, so there is that. Again, I'm guessing that will be enough. When an animal, or even people, lose one sense, the other senses are heightened. She will learn to follow the lead of the others. Even my blind chick, despite not being able to see, follows them when they move from one area of the run to another. Not as quickly, since she tends to probe the area with her beak, or high steps to feel her way, but she get there. I can't free range here, due to a large number of hawks that are constantly taking down rabbits on my property. Not to mention the bald eagle couple that live nearby. Due to my chicks blindness, I would never allow her to free range. She would definitely be a meal.
My eight chicks are now 6 weeks old. I brooded them in the coop with the two big girls (2 yr old) I have. They have been able to see each other for the entire time, but not be in the same space. Last week, I started allowing supervised interaction, and on Saturday, I opened up everything. One of the older hens does pick on my blind chick, and the others, so I had to put pinless peepers on her. The other older hen has decided to be a mother hen to the 8. She actually takes care of my blind chick, by herding her to be with the others when she lags behind. It's been cute.
I still don't think the hearing loss will greatly hurt yours in an integration. Not sure how old yours are, or when you plan to start integrating. This is my first time integrating a new flock to older hens, and it's been a learning experience for me, not knowing how the older ones would react, and especially to a vulnerable blind one. The one I put the pinless peepers on definitely has a thing for the blind one. She was relentless in harassing her before I put the peepers on. My chick could never see her predatory advance on her, and when she was pecked by her, she was terrified.
Best thing to do is continue to observe how she behaves and/or reacts to the others. I think you will be pleasantly surprised at how well she really ends up doing.