Kathy Shower played in a movie where she was jungle and her husbands head cut off. What the name of this film?

The movie you are referring to is called "Cannibal Holocaust". It is a 1980 Italian found footage horror film written and directed by Ruggero Deodato and starring Robert Kerman, Francesca Ciardi, Perry Pirkanen, Luca Barbareschi, and Carl Gabriel Yorke. The film follows a rescue team searching for a missing documentary film crew in the Amazon rainforest, and discovers their gruesome fate at the hands of a cannibalistic indigenous tribe.

Kathy Shower did not appear in "Cannibal Holocaust". The actress who portrayed the character of Faye Daniels in the film was Francesca Ciardi.