The trainer is smart to say it might be medical-and you are smart to get her checked out. I have seen many people just assume a medical problem is behavioral without checking it out first. If she gets a clean bill of health, start potty training all over again as much as your schedule will allow. Take her out often (which you are already doing) and reward her with praise or treats whenever she goes outside. Never punish her if she goes inside. If you catch her in the act (generally if she looks like she is about to go), then try to re-direct her to go outside but if it is after the fact then just clean it up. Good luck!
