I would read this additional article on salpingitis, written by a vet, and read the sections on "treatment" and "recovery:"
http://www.the-chicken-chick.com/2015/03/causes-of-lash-eggs-salpingitis-by.html
 
She may perk up after the antibiotics for awhile, but it won't be cured. I would probably wait at least 3 weeks, since there is not an official egg withdrawal time. Here is some reading from FARAD:
 
Tetracyclines—Chlortetracycline is approved for use in laying hens in Australia and Ireland.16,18 In Australia, chlortetracycline is labeled for use in the drinking water of chickens at doses up to 60 mg/kg (27 mg/ lb) for ≤ 5 days with a 0-day egg withdrawal.16 In Ireland, a medicated feed containing chlortetracycline can be fed to laying hens at a dose of 20 to 25 mg/kg (9 to 11 mg/lb) for 5 to 7 days with a 4-day egg withdrawal.18 In the United States, the egg withdrawal interval for hens following treatment with chlortetracycline needs to be extended from those established in Australia and Ireland to allow residues time to deplete below detection limits. Multiple studies48–60 have been performed to evaluate depletion of oxytetracycline residues in the eggs of treated hens. In Canada, oxytetracycline soluble powder is approved for use in the drinking water of laying hens at concentrations ranging from 50 to 112 mg/L (190 to 424 mg/gal) with 60-hour to 5-day egg withdrawal intervals, respectively.16
 
Those withdrawal intervals should be extended in the United States because oxytetracycline is not approved for use in laying hens; therefore, oxytetracycline must be undetectable in all eggs destined for human consumption. To our knowledge, doxycycline is not approved for use in laying hens in any country. Although multiple studies10,50,61–63 have been performed to evaluate the depletion of doxycycline in the eggs of treated hens, at this time, FARAD cannot provide a blanket withdrawal interval recommendation for eggs, and individuals are directed to submit a withdrawal interval request to FARAD