Was Amelia Earhart’s flight ended through manipulation by the Extraterrestrial Alliance?

This is very much the case. There was a series of manipulations done to interfere with her navigation, and this was counteracted sufficiently by divine realm to allow her to land safely on a small island and at least extend her life for a time. This is in keeping with many such interventions to block human progress. They take special delight in bursting the human bubble by pulling the rug out from under a noble achievement or would-be achievement to thwart it in the end and keep it seeming to be out of reach. This was true of the Nungesser and Coli flight to cross the Atlantic Ocean and be the first to win the acclaim. That distinction fell to Charles Lindbergh only due to divine intervention possible on his behalf because he was more in alignment and there were more praying for his safe passage. It is not that human failure never happens, it is that human conquest of new challenges that break new ground in some fashion and open doorways to new ideas and possibilities that can represent a paradigm shift in thinking and expansion of human culture will be resisted actively and thwarted at every turn by the Extraterrestrial Alliance. This is why humans are still so marginalized. They have the trappings of comfort to some degree and enjoy many technological conveniences, but these, too, are a deception because for the most part they are highly destructive to human life in some way and have additional downsides as well to make people more vulnerable and dependent on others. For example, when humans are not growing their own food and all living by a source of fresh water, but have gathered together into large cities totally dependent on commerce taking place through the Internet and also dependent on the electrical grid, they are very much in peril with a simple power outage, let alone a breakdown of cyber communication that would completely stop the availability of goods and services nationwide. Humans are hanging by a thread at all times and do not perceive this, but are complacent and increasingly vulnerable to gathering forces lining up against them.