At the end of 5.0 she is in a side room at the Rising Stones caring for the lifeless bodies of the Scions whos souls had been summoned to the First. After you save them and bring them home she first helps hunt down Estinien one more time to ask for help, then when the new threat presents itself she leaves the Scions and goes back to Old Sharlayan to ask for help. At the end of 5.55 she is already in Old Sharlayan and working to arrange for us to come so we can find some answers. And we know from multiple sources(trailer, patch notes, hype website, live letters, etc) that at some point in the expansion we will be going to Old Sharlayan, so she must eventually get the paperwork or whatever sorted out for our journey. Something she would be unable to do if she were still stuck in the infirmary.