Mother-in-law is deep into BK for 20 years. Help get her out

My mother-in-law (MIL) has been deep into BK for the past 20 years. What are some ways that she can be deprogrammed?

The biggest problem I face is of talking to her as she speaks hardly any English and I 'codeswitch' all the time, although we share a common mother tongue I am no more fluent in the language to debate with her.

Besides, after every debate she goes back to her books and Youtube videos and this nullifies any progress made.

How can I free her of this vermin that BK is?

It's too late for her. Save yourself. :p

She can only be free when she wants to be. Force applied will only create more resistance. Maybe, slowly, she will awaken to the hypocrisy.