Hello,
Added to the social stigma involved, divorce was also very difficult and extremely expensive to obtain prior to the late 20th century, as was annullment. Very few people, particularly women with no other means of support, took that route out of a marriage.
Only the marriage cert of Florence Lunnon to Thomas Pummell will tell you whether she was married before. Almost certainly if this had been the case I think she would have remarried with either both surnames of Lunnon and Haines on the cert and registration, or married using her previous married surname, not her maiden name.
The two deaths that Nanny Jan mentioned are the right sort of ages so would be worth further investigation.
Vicwinann