
avencorgi2
I talked about that a bit here, too.
I assume it’s also going to about her realizing her powers and what that means for her as a person. That’s what the Russos have said her journey is about. So far her footage frames her in a protective role, she has a plenty good reason to develop and expand her powers.
As far as Pietro–that story wrapped up with Ultron. His death was the final piece of Wanda’s narrative redemption. Besides Marvel Studios not wanting to deal with two Quicksilvers, Wanda’s character and relationships would be difficult to develop if he were still alive. Wanda had only 10 minutes of screentime (including non-speaking) in CW–a sizable chunk of that would have gone with Pietro, and that’s not the story they wanted to tell.
This is true of the comics too. To my recollection, Wanda and Pietro haven’t been on an ongoing together since a little after their Kooky Quartet days. They’ve had story arcs together, but not as ongoing teammates.
And as far as an in-universe reason goes:
Pietro may end up featuring in Wanda’s story in some capacity. But it wouldn’t be surprising to me at all if he won’t, and it would be a screenwriting mistake to bring him up beyond a short, meaningful mention unless they plan on it.
t’challa & shuri: distinguished siblings
wanda & pietro: functional siblings
thor & loki: disaster siblings
Well, we see Bruce and Wanda together here:

I’m not sure if the movie has room for it, but they have at least a little bit to talk about together, so it might come up.
That
said, I think part of the reason for killing Pietro was so that Wanda
could have a story without needing to tie back to him. With every second
of screentime being so important, they might not feel Wanda bringing up
something we already know, that can’t affect the story anymore–she
loves and misses her brother–contributes enough to her development.

Grandpa Magneto Monday! Honestly, bringing a sweater is usually a good idea.
Check my Patreon out if you’d like to support the comic, even a little bit helps. Or just to check out the reward tiers, I tried to make them fun: https://www.patreon.com/waitingforthet
Wanda: If you’re on the sun then sun-dried tomatoes are just tomatoes
Pietro: Wouldn’t they just be dried tomatoes? They’re still not normal tomatoes
[later]
Wanda: I asked Viz, and he says there are no tomatoes on the sun. So, it looks like we’re both wrong, but more importantly, you’re wrong.