No sense interrupting Elizabeth, Tranquillina decides: if she had wanted to talk, she would have joined in.
This trip towards Coeris sounds like a no-lose situation. ((except sorry Ulrich/Peregrine 
)) Tranquillina steps to a spot just outside Le Maison's Aegis and hacks a bit of rock from the ground; she can always Leap back here if the trip turns out not to be fruitful for her.* She quickly writes a second copy of her letter to Mons Electi; unless Alexei is still around (I don't think he is), she'll show both copies to Maris, in the event that a witness to Alexei's signature would be helpful. She leaves the signed copy with instructions to have it delivered to Mons Electi, and brings the unsigned copy with her.
- Tranquillina isn't above generally grabbing Arcane Connections to locations as she goes, of course. That being said, the only one of note she's likely to have in her possession right now is one to near Nigrasaxa, since most of her stuff is still there. And she probably leaves that in her quarters at Le Maison.
Of course this all depends on Maris accepting her company on the journey, which she politely inquires about. ((Who are the other people in the traveling party? And I don't know anything about Maris, although Tranquillina would have learned a bit about her by now.)) [color=magenta]"You are kind to offer to allow me to accompany you, at least until we arrive close to Mons Electi," she thanks Maris. [color=magenta]"I know you offer this with no implied debt, but I can volunteer to help with reconnaissance during the journey. I have various means of traveling with great stealth, as well as vision that I can enhance magically."
In fact, she will cast Eyes of the Eagle on herself as the journey departs ((automatic, even fatiguelessly so in Le Maison's aura; it will last three days and two nights)), and while on the road she'll use her cloak's Gift of the Bear's Fortitude every sunrise and sunset.