I think the marriage to (Horace E) Estes was after the marriage to Cummings.
Based on 2 FamilySearch profiles for a Dorothy Rowe (Dorothy J Rowe , Dorothy Rowe), Dorothy appears on the 1940 census with Cummings, then on the 1950 census with Estes. Her presumed daughter June appears on both censuses, first as June Cummings (age 5), then as June Fuller (age 16).
If Dorothy was married before her marriage to Cummings, her spouse may have been a Fuller. Alternately, June may have been born to unmarried parents. Or June may have had a similar attachment to Cummings.
Dorothy's NUMIDENT file has her 1st application year as 1974, during her marriage to Estes. She updates to Russom in 1976. She may not have been required or had any need to apply during her marriage to Cummings.
There are gaps in Dorothy's timeline which make any analysis suspect, but my view is that these records all represent the same person.
And if we are incorrect, we can always fix it later!