I think this the same Molly because the 1939 register shows the same birth date
NAME: Mrs Molly Flower Button
BIRTH: 13 Jan 1925
DEATH: 24 Mar 2015 - Corby, England
Its strange that she is down as Button on the 1939 register as she would only be 14 and Button is her married name. That is usually added when they marry!
When you search the 1939 register all the names for an individual are indexed.
She is Molly Forester (indexed as Foreston) with the Forester struck out and replace with BUTTON.