One of my Shetlands that I like the best, has lost condition very fast.
A couple of days ago I was thinking 'you're looking a bit thin Dot' to today, being able to pick her up and carry her

She had twins and has raised them well. She'll be a three shear herself. The rest of the flock are in (very

) good condition. Their worming and fluking is up to date.
The whole flock has had pink-eye, and have had antibiotics for that. And Dot had a nasty abscess on the side of her face, I suspect from a cleg bite, which wouldn't clear up, so she's had antibiotics for that too. It's now healed to a small hard lump.
Nothing wrong with her teeth and she's not scouring. In fact she's still eating, it just doesn't seem to be doing her any good

I've put her in the small paddock for now, which has good grass and clover. I've given her a pile of molassed flakey. And I've just drenched her with pro-rumen and co+se because all I can think of is that I have knocked out her rumen bugs with the antibiotics and that my usual 'live yoghurt following antibiotics' hasn't done enough of a job.
Is there anything else I can do for her, anything else it could be? I can see me losing her if things don't turn round tomorrow and that would make me very sad.