I have had two roosters who had something like this going on ages ago.
However, that eye needs to be treated quickly. It is looking like that is 'hardened pus' in the eye, and especially since her eye started out watery, it is likely a respiratory infection of some sort. Is she eating, drinking? Is she mobile at all? That pus needs to be removed asap or she can either go blind or lose her eye. One of my roos lost his eye to this, and trust me, it wasn't pretty.
Yes, it will be gross, but it needs to be done. But, I would first suggest cleaning around the eye. Try to flush it out as best as you can, you can even try to rinse it out with warm salty water before attempting to remove the pus. By the looks of her eye, you might need to try and squeeze it out. Be very careful and use q-tips if you can.
Heres some links that should help you:
https://www.backyardchickens.com/th...e-sinus-lump-swelling-cure-treatment.1156995/
https://www.backyardchickens.com/threads/nasty-eye-infection-pics.1071718/
https://www.backyardchickens.com/threads/surviving-infectious-coryza.1187396/page-2
Once the pus is removed, you need to find some sort of drops to put in her eyes daily until the infection clears up. I have heard that Terramycin works well, but I haven't used it myself. I got some Brolene eye drops (I'm pretty sure that's what it was) and it worked on both of my roosters. But, it won't work if the pus is in the eye.
I would also suggest giving the hen some fresh garlic to help fight the infection. Cut up some small pieces of (fresh) garlic and give her a couple like a pill, I would also suggest adding garlic, honey, and ACV to her water.
Goodluck! Please keep us updated, too.