You don't say when she was transported, but the papers connected with her trial can be seen at the <a href="
http://catalogue.nrscotland.gov.uk/nrsonlinecatalogue/search.aspx">National Records of Scotland</a>. You can go yourself and view them, have someone go on your behalf, or request an estimated price from NRS for a digitised copy of the papers.
The following are records which come up in the possible timescale for anyone named Helen (all possible spellings) Wallace:
National Records of Scotland
Reference AD14/36/351
Title Precognition against Helen Wallace for the crime of theft by opening lockfast places and previous conviction
Dates 1836
Related record JC26/1836/438
Accused Helen Wallace, Age: 18, domestic servant, Address: Howard Place, Edinburgh, Origin: Born in Edinburgh
and/or:
AD14/57/103
Title Precognition against Helen Wallace for the crime of theft and previous conviction
Dates 1857
Access status Open
Related record JC26/1857/307 [and] JC26/1857/307
Accused Helen Wallace, alias Fergusson, Age: 40
and/or:
AD14/63/99
Title Precognition against Helen Wallace for the crime of theft and previous conviction
Dates 1863
Related record JC26/1863/306 JC26/1863/306
Accused Helen Wallace, alias McLean; Ferguson, Age: 40, Address: Inverkip
Precognition is a term in Scots law. It refers to the process of taking statements from witnesses or other informants or people involved in a case to discover what information they can give that is relevant to the case being prepared by the prosecution or defence. It is also the statement itself. The precognition cannot be used in court, unless the person says something that differs significantly from what the person said in the precognition.