Is she a standard sized bird, a round 5 or so pounds? I would start her on 250mg of Amoxicillin twice daily for 7 to 10 days. You can get them here, they are dosed orally... https://www.twincitypoultrysupplies.com/index.php?main_page=product_info&products_id=77I just went in to collect eggs and inspect boxes and found she did lay another softie.. most likely last night.. i’m pretty sure this one had a yolk.
What I do is open the capsule an add it to about 1ml of Gerber Baby food. Load it into a syringe, no needle, and squeeze this mix under the tongue.