Please see all of the acceptable vaccines for US travel here: https://www.cdc.gov/coronavirus/2019-ncov/travelers/proof-of-vaccination.html
I’m not sure your mom is going to be able to travel because the sputnik vaccine is not listed here in the CDC approved list. You can go ahead and take the second Pfizer vaccine, Is the wait time should be 21 days and you have exceeded that. Thanks!
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