(Please this seems like cringe now but try to get the idea)
(This is just ideas mashed In one)

Dr strange power/plot pin points
• yn watches strange
• They can talk through astral projection (maybe)
• Yn fights with evil dark hold (they call her a traitor)
• Takes hit for strange
• The sorcerer supreme  can look inside
Minds-

(In vision)
*• Sees she likes and gets inspiration from him
(As another part (a good one) of her gets held down, like that scene with Wanda.

• While she try's to get out using magic (light purple) (this is in yns mind)
• YN tries to use her powers like strange, but can't hold it and fails. (When trying it's light purple.) then gets hurt, as of being forced to use "evil" magic.*

INFO
• y/n can make petals to travel, she does this often.
• often does/uses Astro projection

Plot- ish idea.
In the process of rewriting, as this is ideas munched together and no proper writing!
Y/n watches strange from a far, he notices her then she makes a portal behind her and she walks back into it,
(this happens multiple times)
again, as she's watching him he notices but doesn't look at her.. he walks out of sight and makes a portal behind her and she doesn't know. He says "who are you, and why have you been watching me" or something like that (or he can astro project or whatever it's called and go behind her and do the same-ish thing) she gets startled and she makes a portal away, he does the same and follows her
(she does this multiple times)
until he makes a portal to Kamar-Taj in front of her so she goes into it, he makes sure she can't get away..
Turns out there was "evil" people there and they notice her and say "traitor" she gets spooked and gets into a defensive state
(one of her eyes flash light purple and the other dark, quickly and sorcerer supreme noticed, she was watching)
and protects dr strange as they try to attack him and she gets hurt, sorcerer supreme gives him a signal with her head for him to go stand by her and watch (wongs there also)
She opens a portal to a hell like place (where they can't get out) under them and kicks them in.. them sorcerer supreme asks her to follow them to a "large room"
And says something like "let me look into your mind, your past, I would like to know more... i see something in you" yns hesitant but nods her head in response after seeing dr strange nod.
She gets on her knees and lets her look (Wong dr strange and sorcerer supreme go into this area where yns past and harmful moments are played on the wall, it's kinda like the mirror dimension)
As they watch yn get on her knees and beg some guy saying that she doesn't want these powers anymore, they made her "evil" and that she turned into a monster.
She was forced to hurt her parents and other people (it shows on screen her walking away from a dark purple explosion or fire)
-it shows her in pain and her screaming
-her watching strange trying to use her magic for good again, and trying to do what he's doing.. she did it (it was light purple) but then she screamed out in pain (it's similar to dr strange's kinda)
-it shows her watching dr strange and smiling admiring him
- shows her walking away from her "good" self and trapping her under the rocks (kinda like that scene of Wanda trapped as the old man tries to help her out)

IM SORRY THIS IS SO LONG!! ITS JUST IDEAS FOR PLOT!! PLEASE ADD YOUR OWN TWIST!!'
(And own parts, I know reading that was chaotic)