You have received good advice for what to look for. It sounds like she was egg bound, and is having some trouble passing eggs. ISA browns are real laying machines, so that can be a common problem. Hopefully, she will perk up now that the egg has been passed, but soft eggs can be hard to pass. Infection can set up if they have eggs break inside, so some will use an antibiotic to treat early to prevent egg yolk peritonitis. Drugs like amoxicillin or Baytril could be good for that, but may be hard to get where you live without a vet.
I recently lost an ISA who had been a great layer until she was attacked by a dog. She recovered after a few months, but laid rubber or thin-shelled eggs for 2 years afterward. I felt that her shell gland was damaged. She suddenly became ill 2 weeks ago and died from what I believe was egg yolk peritonitis.
I recently lost an ISA who had been a great layer until she was attacked by a dog. She recovered after a few months, but laid rubber or thin-shelled eggs for 2 years afterward. I felt that her shell gland was damaged. She suddenly became ill 2 weeks ago and died from what I believe was egg yolk peritonitis.