I also had a quick look and couldn't find a marriage as stated
However on a paid site there is another tree that seems to match these facts
It implies that this is the baptism of
Bridget COLLINSand that she married George JENKINS on March 3rd 1896 but giving no source
Also that she had a daughter Ethel
Ethel's marriage record in Scotland shows her as Ethel COLLINS formerly JENKINS
and her parentage is descibed as
(F) William JENKINS Brushmaker
(M) Bridget COLLINS afterwards married to William BROGAN Labourer
It could be that William and Bridget divorced or never married!