Since posting I have learned that Maria Rynd:
1) Was the daughter of Harriet Jane (not Henrietta).
2) Had an elder sister, Mabelle Gootlatte Rynd, who migrated to NSW, Australia where she married Hugh Snell Chauncy, 1842-12-22.
3) Died in La Paz, Bolivia, 1886-08-31.
Maria's mother Harriet Jane (possibly) Montgomery, drew a military widow's pension after the death of her husband, Goodlatte Rynd:http://books.google.com/books?id=hCsSAAAAYAAJ&pg=PT55&am...
Harriet remarried 1815-11-30, at Westminster, London, to to John Brown(e), with whom she had additional children.
I have yet to find the record of the marriage of Goodlatte Rynd and Harriet Jane (possibly) Montgomery, which I assume happened before 1811.