Theophylact of Ohrid

But why does the Lord reveal the woman? First, in order to glorify the woman's faith; second, in order to arouse faith in the ruler of the synagogue that his daughter also will be saved; and also in order to free the woman from her great fear, for she was afraid as one who had stolen a healing. Thus the Evangelist also says: "she came in fear and trembling."

Commentary on Mark ↗

Bede

But the woman, fearing and trembling, knowing what had been done in her, came and fell down before Him, and told Him the whole truth. Behold where the questioning of the Lord was directed, namely that the woman openly confessing the truth of her long-standing infirmity, sudden belief, divine propitiation, and the healing given to her, would herself be more firmly confirmed in faith, and would provide an example of salvation and life to many. Finally, it follows.

On the Gospel of Mark ↗