Ellen has seen some fairly repulsive things in her life, both on the metaphorical and on the purely physical level. This more or less goes without saying in a post-nuclear world; even if you spend your entire existence sealed up in a Vault there are going to be some things that just turn your stomach- and once you get out onto the surface it's really not going to get any nicer. But generally she's been pretty good at dealing with it.
Andale was probably the worst;
Vault 92 was pretty close behind. The latter she walked away from, taking the one thing of worth the place still had concealed. The former she burned to the ground, and if you ask her the world is better for it.
Given her experience she probably should have known better than to read the contents of the little pocket notebook she found on the man Dogmeat killed in her defense in the Point Lookout swamps. Probably, but she didn't.
If she'd known about the contents of that notebook she would never have set foot on the Duchess Gambit, not while
Tobar the ferryman still lived. How she and Cross are going to get home when neither of them knows how to drive a boat she doesn't know, but she'll deal with that later. Dogmeat did the world a favor when he tore the man's throat out. The fact that they'd trusted him for any time at all- that he'd gotten close enough to even get the knife out while she was under the punga plant's influence-
Well, there are ways to feel clean and there are ways, and this is not the kind of thing that you can wash away with a shower. She no longer has the ammunition for the alien pistol, but Jerald's courtship gift is its own kind of cleansing fire; so if you happen to go out back and spot someone practicing sword drills with a
straight blade wreathed in
lightning, it's just Ellen working through a few things.
She'll be happy to talk as soon as she's done.
[OOC: Sorry for all the links! Just wanted to make sure the references were available, I keep forgetting how much backstory she's accumulated by now.]