There's at least one plan that could work. . . although Team Sansa would never stoop to attempt it.

Sure; but in the opening credits for S6E7 they showed us Mereen. That's usually an indication that at least one scene in the episode is going to be set there.

Those things don't help, to be sure; but I can't help thinking that if it had been Arya Stark standing in House Glover's forecourt rather than Sansa, she'd have come up with something quintessentially Stark-like to say that might have changed the outcome.

Catelyn was more in tune with how things work in King's Landing and in Westeros outside of the North (if Ned had just listened to her warnings about the snake pit King Robert was leading him into, House Stark could have avoided a great deal of grief), but she was never really of the North.

True. It almost looks as though Arya is jumping down onto the Waif to attack her. . . which would require her to have immense powers of recuperation, but which otherwise might make a certain kind of sense.

Sansa is getting very good at invoking the name of her House. . . but of all the children of Caitlyn Tully and Eddard Stark, Sansa is the only one who unmistakably takes after the Tullys. If she looked and acted more like a Stark (see, e.g.: Jon Snow), I think she'd have had an easier time bringing the former Stark…

I'm not sure what the Blackfish can realistically do to help Sansa, beyond keeping the Lannisters and Freys tied up at Riverrun (which isn't nothing, but still).

It's definitely weird. When last we spent time with her, she was in the throes of a crisis of faith. . . but you'd think that her newfound ability to break the chains of death would have helped her out with that a little.

Good question. My guess is that Jon and Davos know Melisandre well enough by this point to know that Mel's "strategic advice" is always a variation on "Sacrifice X to the Lord of Light and he will grant you victory," with "X" invariably being lives, blood, souls, or fractional portions thereof.

The story that Davos/Jon are telling is only true if the oceans freeze solid (not utterly impossible - the "seas drying up" was part of the Maegi's prophecy to Dany in Season 1) or the White Walkers build a navy. To date, they don't seem especially interested in swimming, let alone sailing, so it's probably safer for…

Sansa probably figures that "My friend Melisandre, a talented shadowbinder, blood mage, and priestess of a strange foreign cult" wouldn't be a net asset to her diplomatic pitch.

It's not impossible. . . especially now that we know Bran is capable of leaping through time and space to put random thoughts in peoples' heads.

If the High Sparrow sent Lancel & Co. to the Red Keep to arrest Olenna, they'd be greeted by a wall of Tyrell pikes. The High Sparrow is smart enough to know that House Tyrell can only be pushed so far before it has to strike back.

The Tyrells have a huge force in King's Landing, and even if the High Sparrow could somehow manage to defeat armored, mounted knights with a force of cudgel-wielding thugs. . . the Tyrells are also in control of the city's food supply.

We've seen the Waif interacting with Jaqen when Arya is nowhere around, so Arya would need to have a very vivid imagination. . .and in that case, she might be imagining Jaqen as well. Seems a bit far-fetched to me.

A lot depends on how much information Sansa has been getting from her ravens. Littlefinger is by far the most likely person for her to be writing to, since he's already offered her his help and has a massive army at his disposal. . . but there might be a couple of other options.

Eww. Now that you've framed it that way, I'm struck by the overarching realities of that scene: the young Lady Lyanna, who could have safely sat this whole thing out (she lives on Bear Island, after all), has been manipulated into making a very powerful enemy and sacrificing what few forces she has for a fairly…

True. . . something along the lines of "I am carrying your child, the trueborn Lord Bolton, and when your bannermen learn of his existence, parricide, they will turn on you in his name" would completely screw up Ramsay Bolton's day. . .he'd have to send an army to kill Sansa before she gives birth.

That actually might have done the trick— except for Lady Mormont, who lives on an island and therefore really doesn't have to worry overmuch about the Wights. (The Greyjoys, on the other hand, are a much bigger potential threat. . . but then, it doesn't look like they're interested in the North at this point).

That would be amusing, but we can see that her message is only two lines long. To really infuriate and taunt him, she would have used smaller script and sent him a whole tirade, akin to the one she sent to Jon Snow. It's a pity she didn't. I wish she would.