 Re: as to how she has
acknowledging your sincere prayers comes (as?) a gentle tap from the Greater Heaven...Ms. V. Aruna, alumnus of Anantapur Campus of Sri Sathya Sai University narrates as to how she has experienced His Gentle Tap. ...adapted from June 1994 issue of Sanathana Sarathi.
Yes, and indicates a slightly different meaning to 'narrates how she has..." which is also grammatically correct. By including "as to" before the "how', it suggests that the actual ways, details of how she has experienced the tap are discussed. One can "narrate how she experienced His Gentle Tap" and give no further detail. That is, she is merely reporting that she had once experienced His Gentle Tap. As I said above, by adding "as to" before the "how' , one is stressing that the narrator goes into this in detail.
Having said that, "as to how" is somewhat casual, and not really in keeping with the religious nature of this writing. A better way of expressing it would be, "narrate just how she experienced", and the "just how' serves the same purpose as "as to how".  | 
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