Your Sophia Streeter is my 4x great grandfather's half sister (James Streeter). I don't have much info Sophia apart from that she was Bapt: 9th March 1821, East Farleigh, Kent, England.
Hopefully you maybe be able to fill in some blanks for me ! James and Sophia mother was Elizabeth ____. Her 1st husband was Stephen Streeter (our James' father) but I don't know who Sophia's father was.He must have also been a Streeter for Sophia to have Streeter as a surname.
I can go back and forward a few more generations, email me if you would like further info etc.