Her doctor is likely not going to know any better than she does. The manufacturer, and the scientists involved, are in the best position to answer this question.
And the doctor is going to have better information about this vaccine than is available to the general public? That seems highly unlikely - there is not some secret doctor only channel for information on drugs. Hence why the guidance is lacking (I would not be complaining if instead the guidance was "overly technical" or something).
No, a doctor is going to have better information about the specifics for her situation and whether or not the risk of a reaction is worth the benefit of the vaccine.