Brahma hen cannot stand.

[Cyprus]

I would look into reproductive disorders which can cause an interruption in laying, decreased appetite, weight loss, runny poops, sometimes an enlarged lower belly from internal masses or fluid, lethargy, slow or poorly functioning crop, and the tail down posture. Most of the time, they die when they stop eating, and we do not know for sure what was wrong until we do a home necropsy and look at the organs. This just seems to happen so often. I hope it is something that may have a possible cure. Here is a good link to read:
http://www.theveterinaryexpert.com/backyard-poultry/egg-yolk-peritonitis/

Would an Epsom salt bath be benificial?

 

[Eggcessive]

It might make her feel better, but if she seems to weak, it could make her worse or put her over the edge. Many people report their chickens love a soothing bath. If it is a repro disorder such as EYP, it may not help, but if she has a lash egg stuck high up, it might help. It might not hurt to give her a dose of a human calcium tablet for calcium and vitamin D which can help with laying a stuck egg.