How to assist someone with self-representation if their command of the English language is extremely limited?

Question Details: My mother is a co-defendant in an interpleader action with a life insurance company. She cannot afford an attorney and she does not speak English. I've been communicating with the insurance company and other co-defendant's attorney on her behalf through a Power of Attorney. I not an attorney. How do I speak for her in a pro se case or can I? Would she need a court appointed interpreter or can I continue to act on her behalf before a judge?

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