221g processing white slip

Hello there

My mom got 221g white slip ( B2 visa renewal)last February 2021 at Chennai location. They asked her to come back when the embassies resume regular operations and appear for an interview on any week day.
Is there anything we could do other than waiting? It’s over an year now and we haven’t heard back from embassy. Do we need to make an appointment again or just walk in when the embassies are open? Could some one please let me know?Thanks in advance.

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