Hi there, had a check of the register today, you have all the information there is
Sarah Jane
born 21 June 1873, Baptism 9 July 1873
Parents William & Jane Howard,12 West Street, Labourer
I also checked for burials for William Howard up to 1875 but nothing for St Michael's I'm afraid.
I will check at Archive later in the week to see if he's in any other parish in Southampton for that time.
Regards
Kyrenia