Hen is only able to walk a few steps, then falls down. Please Help!

[Momoftres]

I have a two-year-old wellsummer hen that is unable to walk more than a few steps without sitting down and using her wings to balance. She’s able to drink and eat if I bring her to the water. Her vent is nice and soft and I don’t feel Any. Not sure when she laid an egg last.
What should I do? I can put her in a warm bath with Epson salts if you think this is egg bound?

 

[nuthatched]

What's her diet? Do you have any calcium citrate?

 

[Momoftres]

They are on egg layer pellets with 16% protein. I do have Tums. I just gave her nitri drench. Kambach farms?

 

[Momoftres]

I have her out lukewarm water bath right now, I checked her vent and I don’t see any signs of mites

 

[Momoftres]

This is her

 

[Momoftres]

OK, so I’ve given her scrambled eggs, tums, brewers yeast. I felt for an egg and did not feel for one. She seems to be running a fever. I’m thinking this is Mareks. Any other ideas?