Acceptance. It makes sense. Lexa can understand why someone would not want to be tossed aside by their society. She knows that her people could be seen as cruel for doing it, but it was always in the name of survival. Even now, she can't shake that. It's hard for her to fully sympathize with Aloy's plight as a result: Lexa had always been cherished, loved, promoted, and praised. As a young warrior, she had been taken under the wing of one of their foremost warriors. As she grew up and was found to be a Nightblood, she ended up being the favorite of the novitiates. She can't speak to not belonging because her confidence comes from a place of importance, of significance: she has never believed in anything else for herself. Her people may struggle to survive, but she will always be the one who will help them do it regardless.

"Then you will fight, or act, in any way that you feel suits your people best." Lexa is and has always been a big picture person. Even in feeling confident in her standing, she has been trained to see the greater outlook. She has a harder time defining another individual's actions moving forward, if only because life has been so defined by surviving, by making it out alive, and so forth.

Which is why she proceeds to add: "Being here will make it easy for you to find acceptance, if you want it. It will be up to you how much you give yourself to that." It's cryptic, but she can see in Aloy what she saw in Angel. As much as she likes to tell people not to give themselves wholly to the Nest, to never lose that divide between selfhood and unity, she can see when she can't help it. Even Bellamy is the same way. He would have given himself regardless.