Advice -lonely hen?

I'm new to this page, I have no idea how to use this so I hope somebody can help.. I have had 5 rescue battery hens, when two died we got 5 more, granted the old ones were about 2 so after their ordeal they have slowly gotten poorly and died until we had one of the old ones, mixed with the 5 new ones, she then got poorly and we thought she wouldn't make it, she is now fighting fit again, but she has been kept away from the new battery hens for around two weeks now as she was so poorly, she has now taken to standing at the gate where the other 5 are kept, but after putting her in this afternoon, and her getting pecked at, I took her back out. She just stands at the gate or under the bush next to the gate looking at her old run around with such longing, she has the house and garden to have the run of but I think she's lonely, is she best off on her own or does she need reintroducing? It breaks all of our families hearts seeing them so poorly as we got so attached so we don't want her to get bullied to the point she also gives up, as she is our last remaining original and we're so very fond of her. Any advice would be greatly appreciated as I couldn't make a new topic for some reason. Thank you..

The fence separating them is only wire so she can see them at all times but I think it's a grass is greener situation. She wants to get in, they want to get out. They eat the food and keep her pushed out of the way. It's worth a try though. Thank you for your advice. I'll try them both as soon as possible.

They don't live to a very old age...but how many water/food containers do you have?

I have been advised to put my two new Brahmas in with my three sussex when the sussex go to roost but I am so scared that they will attack them before I open up in the morning.
So at the moment they are in separate runs but can see each other and I put them all together for around ten minutes each day but not at treat time as that is when they start to run after them and peck them. Think eventually they will all be ok.
Hope yours will be too.

presume they don't free range...could you hang some cabbage (spring is tasty), or some leaves offcuts.
Mine will remind who's who and currently they are 3 whilst Roberta is hatching.