I think the person you're looking for is called Ann McGann (not Ann McGovern). She married Patrick McCormack (or Cormack) on 23 May 1830 in St Francis of Assisi RC Church, Grove Crescent Rd, Stratford. I saw the original register in either 1979 or 1980 when I first started looking at family history; however, I can't now remember where I saw it.
You have listed five of their children but there are two more! The youngest was James, born in 1849. I am descended from the eldest, Anthony George McCormack, who was actually born before his parents got married. In the same register I saw his baptismal record for 1 April 1825, giving Patrick and Ann as his parents. I don't know why they hadn't married at this time.
I'd love to exchange more information about descendants. I'm afraid I have never tried to trace Ann's parents because I was originally just interested in the McCormack name.
Let me know what you think.
Alison