Well I checked on the hen today she laid an egg but her vent is prolapsed again and she has the white stuff down her back side again. Been looking around for information and a lot of different ideas come up. Going to try and keep treating the prolapsed first then see about the white butt. One post said every prolapsed they had had the white rear discharge.
It may just be poop ...because of the prolapse a lack of control in that muscle .
will she be getting a bath ? after that take some real honey & wipe that in & around the vent ..helps healing
They suggest separating her & putting her some place quiet . giving her no layer for a few days . Just greens , Etc