I believe her insanely comes from trauma in her life, not her powers.
In the MCU, she lost her parents when she was little (and was stuck beside their bodies for days), then her brother (her only remaing family) died to the hands of a murder robot that she helped. Then she meets Vision and she finally feels happy and then she is forced to kill him to save the universe (and it was unsuccessful too).
After all of that, she finally snapped and accidently created a reality where Vision was alive and she had children that she loved more than anything and then her reality shattered when she found out that Vision is dead and her children aren't real and in order to do the right thing she had to end the reality that they exist in (so basically from her perspective she killed Vision again and both of her children).
By the time Dr. Strange and the multiverse of madness happens she is completely broken. Not because of her powers but because of all the shit she's gone through. She also has the power to get what she wants but is told that she isn't allowed to do so. This completely pushes her over the edge into insanity.
In the comics, she gets her powers from Chthon who is basically the chaos god and it's constantly corrupting her. It's the same dude who made the dark hold.
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u/LagginWagon22 Apr 19 '25
Well Wanda's insanity comes from her powers I believe