we have noa1 and noa2(I-797?), a letter to my pinay that approved I-129 forwarded to the embassy, and a letter addressed to her that she can schedule interview at embassy. She has appt St Lukes and appt at the embassy. She thinks there is a letter that states case ready is needed before interview and states other pinay have had interview cancelled or denied without this letter. i have not seen this requirement altho she has shown me pictures of letters saying case ready. fees are paid and DS-160 done. Do i need to contact UCIS to get such a letter? Thank you