As you saw intuitively, this was an alien abduction that took place. The reason for the memory lapse is because the memory of the event was suppressed. This is to be expected with such events, that every attempt will be made to wipe the memory clean. This, nonetheless, was a trauma for which she needs assistance. There is awareness in the deep subconscious it has taken place and is a cause of great disquiet within her, and is the reason she is bringing it up now many, many years later.