@Eggcessive - THANK you so much for your answer and help!!! Gave her her first "soak" as well in an Epsom Salt bath and she seemed to love it more than the others I'd had to do it for ;-) Found her yesterday IN the box below their roosts- and when I went to sit down with her, she vomited up more than I'd think possible- guess I leaned over a bit too far to sit down

.... Ironically I refused to do this for her when she was dealing with crop issues for over a month I think it was before she finally started to see all better.... even laid some eggs... but then came the dreaded symptoms her sister has been dealing with... thus the Baytril...
She seemed so uncomfortable and am thinking she may have leaned over herself on the roost as there was a large volume of liquid in the sand but no idea what happened or how she ended up down there... SO after she did that and seemed to still have SUCH a full crop and not having any respiratory problems... I went ahead and leaned over again a bit and massaged her crop a bit- and Lord- she let out SO much stuff second time- thick and green/brownish- nasty- but I left it on my boot/floor and focused on her- tolerated it great thankfully and seemed to feel SO much better and relaxed... Gave her the bath and offered some scrambled eggs a bit later not wanting to give her antibiotics on an empty upset "stomach"...
WHICH finally brings me to my next biggest question ;-) ....do chickens have intestinal upset with oral antibiotics like humans do?? I know everyone mentions probiotic supplementation afterwards so I'm assuming they can...
I've only given antibiotics once before- and was SQ to her sister for EYP- did GREAT with it!
Oh guess I did give antifungal to the Chicken in question for her sour crop-for full week- ended up needing ACS for 10 days TWO separate times as well- took the suggested time off in between and FINALLY she stopped having a doughy crop and started to look better! (was "impacted" briefly in middle there- think she ate some long weed as I saw bits in her poo when she finally had a solid one after many massages and oils... Good times, I'm telling 'ya!! )
ANYWAY-
We ended up after all that and your sweet quick answer- going with once daily dosing as it was soo late in afternoon by this point (w/above and bathing her and her sister who was days past needing it-butt FULL of dried on poo.. but had been unseasonably cool)
BTW- she has been eating OK- and her poop had FINALLY stopped having the yellow in it again, but when they were in the shed with me yesterday, she pooped like 3 times and was quite 'explosive' and liquid...but brown and o/w normally digested.
SO I gave approx 0.35-38ml-to each after weighing them both once they'd had time to dry off a good amount (snuggled both in towels which they seem to love- fall asleep while stroking their little heads in a portable chair that rocks!)
KNEW I'd be super happy I built my new coop with an enclosed "shed" side for me to do things like this with plenty of room!

They ironically weighed exactly the same- checked sev. times- but both down a bit at 4.5lbs so went with lower end of the amount I'd seen for daily dosing- (0.15-0.2ml/kg) since I had no time to ask again...Hubby helped, so able to easily give it without question they got it!
Anyway- they both seemed fine when I finally went in last night- they had walked around together for a bit picking at seed heads in the yard etc. but didn't see either of them eat a whole lot afterwards....
I know I SHOULD have been out right away this am to check her crop- since she had undigested stuff in there from day prior yesterday and had crop issues in pretty recent past

but unfortunately- I myself am pretty sick AND nursing a VERY painful shoulder injury!? (esp after yesterday) not to mention my normal back/other chronic stuff! (AND In-laws coming in 2 days!!) Feel just awful- but will get out as soon as I finish this and get my own meds in with some food...also didn't isolate her as she did so poorly before and got quite anorexic until I put her back with her flock...like 4 days in.

that she's Ok... been thru So much and was doing SO good- back to bright red floppy comb as she be-bopped all over... She's a goofy sweetheart! Ugh...
It's been a REAL challenge... I'm so sorry to write yet another long post...
Can't thank you (and many others!) enough for the help! and will try to update later...