I find it best for trained yoga teachers to ask therapeutic questions of those who teacher-trained them. In that way there is an integrity to the teaching, a connection to the lineage, and the development of a process that fits that expression of Yoga.
That having been said, if the student is under a doctor's care then it's best to move forward within that context and make sure you are following that which has been outlined for her in terms of physical activities at this point in her recovery.
Since you do not mention whether she has a pre-existing yoga practice, the nature of that practice, her age or level of fitness, it is thus very difficult to say much of anything.
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