Hi
There doesn't seem to be a baptism for her showing on line in the London area.
The 1st February 1866 marriage at St Phillip Bethnal Green has Albert aged 27 a bachelor, occupation painter with father John Jenner a druggist. On 13th April 1863 an Albert Jenner of full age, a bachelor and a druggist with father John Jenner druggist married Louisa Brown a spinster and upholsterer. Like Caroline she signed by making her mark. Albert's signature on both marriages is very similar.
The Rosina Jenner who married at St John's Walworth 10th February 1907 a spinster and laundress, father Albert Jenner painter, gave her age as 44.
Albert and Caroline appear on the 1871 census in Southwark with daughter Rose aged 3 and son Albert aged 1.
Is it the same Rose/Rosina?
Regards
Valda