Why does Veta finally refuse treatment for Elwood and insist in his being released?

Veta ultimately refuses treatment for Elwood because she realizes that his delusions about his imaginary friend Harvey, a six-foot-tall rabbit, do not harm him or others. She comes to understand that Elwood's kindness and unique perspective on life are more valuable than conforming to societal norms. Veta decides that his happiness and freedom are more important than fitting into conventional expectations, leading her to insist on his release. This decision reflects her acceptance of Elwood's identity and her desire for him to live authentically.