Sinn Fein will make all their usual arguments about her being a former political prisoner, a prisoner of war and how she was engaged on a mission against a legitimate target. They will reference the Good Friday Agreement and point out that other ex prisoners sit in Stormont.
On the Unionist side, there will be outrage. There will be much stomping of feet and the strongest condemnation of the appointment.
After all that, she will still be the Special Advisor and life on the hill will continue albeit, Mr Allister will no doubt continue to raise his objections long after any DUP/UUP objections have died down.
What is really the issue at hand though is the shocking and continued hypocrisy of Sinn Fein. Sinn Fein are happy to bleat on about disrespect and lack of consideration for the opinions of Nationalists and Republicans when an RUC memorial is planned in Lisburn or when Unionists want the RIR to have a homecoming parade. Odd then, that they are happy to disrespect the family of Mary Travers (McArdle's victim) and pay no consideration the opinions of Unionists through this appointment. Sinn Fein, of course, have form for this. Gerry Kelly is a particular bitter pill for Unionists to swallow but swallow they do, in the name of peace.
Were Sinn Fein serious about showing respect to all sides of the community they would never have made this appointment and would already be trying to bring new blood through, untainted by past crimes, to replace the more divisive figures in their party. Only then, could they truly claim they wanted to govern for all. I'm not trying to comment on the validity or lack thereof of any past crimes. I understand Sinn Fein's argument, but it doesn't change the fact that they have been completely neglectful of their duty to represent all the people in this country, not just the ones that agree with them.