How was the mythological creature echidna become a monster?

In Greek mythology, Echidna is often depicted as a monstrous creature, described as half-woman, half-snake, who is the mother of many famous monsters, including the Chimera and the Nemean Lion. Her portrayal as a monster stems from her association with chaos and her role as a progenitor of various legendary beasts that threaten humanity. Additionally, her fierce nature and her dwelling in dark, remote places further solidify her image as a symbol of danger and the untamed aspects of nature. Ultimately, Echidna embodies the fear of the unknown and the monstrous elements of the natural world.