I heard from the Mitchell Library - this is the information they sent
Helen Quin, born (approx.) 1866 in Tyrone, Ireland, applied for relief in 1904 (ref: D-HEW16/4/9, 2686)
- Helen Quin, born (approx.) 1867 in Tyrone, Ireland, applied for relief in 1909 (ref: D-HEW17/632, 108459)
This matches the person whose death I found, in 1909, but does not provide a link to the births of the two children.