I couldn't find much about Vinita Merrill on Ancestry.com, but here is some of the information I found, in case you don't have it:
According to the Social Security Death Index (SSDI) Vinita Merrill was born 26 August 1904 and died in December, 1977. On a Public Records database on Ancestry there is an address listed for her: 37-30 83rd Street Jackson, Heights, New York 11372. On that record, her date of birth is 26 August, 1905. On the SSDI, it lists her Last Residence as 11372, but the Last Benefit is listed as Lincoln, Nebraska 68502. This may either mean that she was in Lincoln, NE at the time of her death, or that someone who applied for the Lump Sum Death Benefit may have lived there.
I see in the 1910 to 1930 censuses that there was a Vinita Merrill living in Oklahoma. Do you know where she was born?
I couldn't find any obituaries.