There is an 1840 marriage of Helen Lockhart to William Kirkpatrick in Dumbarton.
Which is precisely why you ruled her out in your thread in the Canada forum when I first listed the available/known candidates and suggested trying to track them down in order to rule each one out if possible:
1. b 1815, Dumbarton, parents John Lockhart, Janet McFarlane
2. b. 1813, Dundonald, parents John Lockhart, Janet Walker
3. Helen Sibbald Lockhart, b. 1812, Haddington, parents John Lockhart, Isabella McWilliam
4. b. 1812, Kettle, parents John Lockhart, Margaret Rollo
-- you had rapidly settled on her, and then came back (reply 25, which I specifically linked to in my post above) and said:
I come crawling back, my tail between my legs! I was wrong. Helen Lockhart from Dumbarton stayed in Scotland, married William Kirkpatrick in 184O.(edit) in 1851, Helen Kirkpatrick, born c1820, is living with her mother Janet Lockhard, son William Kirkpatrick, and brothers Charles and Duncan Lockland (all names as transcribed by Ancestry) in Cardross, Dumbartonshire.
And I'll add now: in 1841 Helen Kirkpatrick is living with Janet Lockhart and Charles, Duncan and John, and 11-mo-old William Kirkpatrick who would be her son, in Cardross. An Ancestry user corrected her surname in 2011, from "Kerkputrick" to Kerkpatrick.
>>>> It might be wise to contact that person.
- edit - i.e. to get some of this "proof" you want someone else to provide -- in this case, proof that the Helen Lockhart born in 1815 in Dumbarton to John and Janet is NOT your Ellen, as is perfectly obvious.
FS shows Charles McGlashan Lockhart baptised 1816 and Duncan Lockhart baptised 1818 with the same parents as Helen 1815.

I wouldn't want anyone else to spend time on that one again.
The likelihood that Ellen was not closely related to the other Scottish-born Lockharts who were living in the same county in NY state at the same time and getting hatched and matched at the same church remains slim ...
For a summary of that family (the thread contains enormous detail and suggestions for further investigation):
http://www.rootschat.com/forum/index.php/topic,601912.msg4590678.html#msg4590678and in more detail:
http://www.rootschat.com/forum/index.php/topic,601912.msg4593852.html#msg4593852And re Elexis Lockhart (below in this thread), who has been absolutely and completely 100% ruled out:
http://www.rootschat.com/forum/index.php/topic,601912.msg4582486.html#msg4582486 et seq.
(and all the investigation by me that preceded that ruling out by heiserca)