Hi Dewdrop,
I attended a talk by a member of the garda vetting unit recently.
Does your friend have an address in Scotland yet? If so she can be vetted from there. The garda giving the talk said that there is european wide co-operation on vetting - as long as the person has an address in the state to be vetted.
It is not up to an individual to obtain their own garda vetting - if an employer/university etc. want to have you vetted they make the request to the garda vetting unit. This report goes back to them - not to your friend.
Another option might be to ask a local garda that is known to him/her to provide him/her with a letter that he/she does not have any criminal convictions to her name.
Good luck,
HP