Conversation so far:
What sort of controversy did Eileen have?
wrote that no secret accomplice was needed as the information described in Garrett's seances were "either commonplace, easily absorbed bits and pieces, or plain gobbledegook.
Who wrote that?
Melvin Harris a researcher who studied the original scripts from the case.
What other controversies did she have?
In 1978, paranormal writer John G.
Fuller wrote a book claiming that Irwin had spoken through Garrett.
This claim has been questioned.
Who questioned the claim?
Magician John Booth analyzed the mediumship of Garrett and the paranormal claims of R101 and considered her to be a fraud.
According to Booth.
What else did booth have to say?
Garrett's notes and writings show she followed the building of the R101 and she may have been given aircraft blueprints from a technician from the aerodrome.

Question: What other controversy was there?
Self-contained rewrite: What other controversy was there besides Garrett being given blueprints from a technician?