Ok update...RIR is on the mend. She had stopped eating,drinking and had lost 2/3 weight of other RIR!! Gave 1/4 ml of ivermex injectable orally ( to all 6). Put 9 ml of Remedy Recovery pet wormer (from TSC), which is piperazine citrate in water (5liter water). Took all other water sources away...
Have 6 backyard chickens, my one RIR is acting sluggish, bent had poo dried up all around her tail feathers. I cleaned her up with warm water and her vent was clear. Felt mo eggs in her abdomen. Poops fine it seems. No other chicken is acting funny. But have had 2 miniature eggs in nest...