Helena
That is most important, yes. Living with someone when things are awkward and things left unspoken is unnecessary stress, especially in an already stressful situation such as the apocalypse and uncertainty of life here.
If she knows you as well as you have claimed in the past, I imagine the knowledge of everything will help her understand how you have been acting. And while I imagine you would be more at ease had it not come with you, there really is nothing that can be done on the matter. The nature of the Astrolabe and this world make it troublesome being here but you took the necessary precautions upon arrival. Unfortunately, sometimes that is all one can do no matter how much you may wish to have more control on the situation.