Don't think that 'my' Alice Betts was the Alice Janet Measor who had married Charles May in September, 1877.
She married Charles Betts two years later on 3rd September, 1879. She refers to herself as a Widow with the name Caton (not May) on her marriage certificate and her pob is consistently Romford.
I think the maiden name Alice Janet Measor came up as a possible alternative to the name Meason (which I think is what is written on the marriage certificate of Alice and Charles Betts). It is possible her maiden name could be Alice Janet Measor, bit if it is, I don't think she's the one who married Charles May in 1877.