Update: I bought Sarah Jnr's marriage certificate to Charles Bower, her second husband. It lists John Browning as her father. His occupation was Foreman in Docks. Sadly it does not say deceased to provide any sort of potential time line.
I have found a marriage for a Sarah Browning to Thomas John Watts in 1854 in Wandsworth. There are 2 deaths for a Thomas John in 1854 and 1855 which would make her a widow by 1861.
I've not really investigated this turn of events but I wanted to update a post and not start a new one.
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Toni 
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