As we can see, Florence was a single woman at the time she came into Thomas's family group, so from her side of things, there was no obstacle to marriage.
However, as Thomas was already married to Emma, we can assume she was living until around the time that Thomas and Florence wed.
The 1939 Electoral roll

!0 Beaconsfield Rd.Tottenham,
HAWKINS, Florence
HAWKINS, John
HAWKINS, Thomas
MARTIN, Sarah
Sue