Louisa Jane MOLLOY married Arthur WILLIAMS 24th September 1893 at St. Matthew's church, Newington, London, England. Arthur WILLIAMS, 29, bachelor, Seaman of 40 Darwin Buildings, son of John WILLIAMS (carpenter) & Louisa Jane MOLLOY, 20, spinster, daughter of Charles MOLLOY (Shoemaker). Witnessed by Charles MOLLOY and Elizabeth ALLISTON. 
1881 Census of England & Wales: 3rd April 1881 14 Trafalgar Buildings, Greenwich, Kent, England
There is no records of her or her husband in the UK after her marriage in 1894. The surname Williams is common, so it is difficult to determine if she was widowed and remarried, or if she died in the UK, or if they both emigrated.
N.B. There are no Ancestry trees which show Louisa Jane's marriage or any descendants from her.
↑ 1.01.11.2 "General Register Office Birth Certificate of Louisa Jane MOLLOY" 1873 Dover Registration District (Sub District: St. James), Kent, England. Entry No. 70. [”General Register Office Birth Index for Louisa Jane MOLLOY” 1873 June quarter, Dover Registration District Volume 2a Page 795 Mother’s Maiden Name: SMITH GRO Online Birth Indexes
↑ 2.02.1 "General Register Office Marriage Certificate of Arthur WILLIAMS & Louisa Jane MOLLOY" 1893 St. Matthews church, Newington in the registration District of St. Saviour London, England. Entry No. 177. ”General Register Office Marriage Index” 1893 September quarter, St. Saviour Southwark Registration District Volume 1d Page 125
↑ 3.03.1 "1881 England & Wales Census" Class: RG11; Piece: 723; Folio: 54; Page: 1
Original data: Census Returns of England and Wales, 1881. Kew, Surrey, England: The National Archives of the UK (TNA): Public Record Office (PRO), 1881. Image available at Ancestry.co.uk and FindMyPast
It may be possible to confirm family relationships with Louisa by comparing test results with other carriers of her ancestors' mitochondrial DNA.
However, there are no known mtDNA test-takers in her direct maternal line.
It is likely that these autosomal DNA test-takers will share DNA with Louisa: