http://www.ballaratgenealogy.org.au/ballarat-history/eureka/item/341-genealogy-of-the-lalor-family perhaps our OP may consider emailing some of the people who have contributed to the info on that link.
I did not see any mention of any Ellen as a sibling for Peter Lalor born 1827, the youngest child.
Cheers, JM
http://www.ballaratgenealogy.org.au/ballarat-history/eureka/item/341-genealogy-of-the-lalor-family..."The following is what is known of Patrick LALOR and Anne (Dillon)'s twelve children:
James Fintan LALOR, b. 10 Mar 1807; d. 27 Dec 1849.
Margarett LALOR, b. 01 Aug 1808; d. unknown.
William A. LALOR, Sr., b. 23 Jul 1810; d. 05 Nov 1892.
Joseph LALOR, b. 08 May 1812; d. unknown.
Patrick LALOR, b. 28 Mar 1814; d. unknown.
John LALOR, b. 01 Jun 1815; d. 25 Jun 1874, Kent, England.
Mary LALOR, b. 25 Mar 1817; d. 30 Aug 1850.
Jerome LALOR, chr. 25 May 1818; d. 31 Dec 1898.
Thomas LALOR, chr. 06 Aug 1820; d. 05 May 1864.
Richard LALOR, chr. Apr 1823; d. 12 Nov 1893.
Catherine LALOR, chr. 06 Apr 1825; buried 29 Jul 1885.
Peter Fintan LALOR, chr 05 Feb 1827, d. 9 Feb 1889.
2. Margarett (b. 01 Aug 1808 / d. unknown)
Margarett was born on 01 Aug 1808 at Tenakill.
Margarett, also known by her middle name of Ellen, had married James Bergan in November 1832. James was transported to Tasmania. There is a story that that James &
Margaret, (or Helen or Ellen) were the owners of the Colonial Inn at Campbell Town in Tasmania known as "The Fox Hunter's Return" but this is yet to be verified....."