I'm sorry to hear about your situation and hope I can help.
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First off, it is extremely extremely unlikely that she would actually be called to testify on how the jury reached it's conclusion. This would ONLY occur, possibly, if an appeal were filed based on juror misconduct.
There are no set rules regarding whether subpoenas overcome medical excuses or not. Typically, the court would try to provide her with some accommodation to maintain testimony
, but a doctor cannot prevent her from testifying if it comes down to it, only the court can rule on that.
She could make a motion to quash the subpoena, and the court could decide to quash it based on her medical excuse, but it would be more likely to instead require a deposition or declaration instead of subpoenaed trial testimony.
But do keep into account that it is an extremely remote possibility that she would actually be subpoenaed to testify in this matter. (And if there's no appeal filed within the first few months, it's basically a certainty that this won't happen).
I hope the above information is helpful.
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