Go to the US embassy london website. Then visas. Open the contact us in the left menu. The last sentence starts with visa information. Open the CONTACT US link and scroll to the bottom of the questions to STILL HAVE A QUESTION. Open that and fill in the form. Name has to be the one on the DS-160. Also include your LND number.
And email addresses.
The embassy does not do afternoon interviews so they scheduled her interview in the morning and her medical is scheduled early afternoon.
Keep in mind the embassy will keep the passport at the interview so take a second form of photo ID to medical exam.
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