You do not give the complete story, but I assume your mother has no California contacts other than the credit union account. If your mother was conserved by a Georgia court, it seems that California courts are bound to recognize the decree as a valid Sister-State Judgment. The quick answer is that it seems unlikely the credit union has much legal backing for its refusal to recognize the conservatorship.
This is not personal legal advice, but an answer to a hypothetical question from someone I don't know.
I agree with the prior attorney. Under the rules of comity and full faith and credit between states, the state of California and by extension the credit union must recognize the court decision made in GA. You just need to keep talking with them until you get to someone who has the knowledge and experience. Perhaps ask to talk to someone in their legal department.
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