Whatever it is I hate to see whoever she goes up against in the next Dr. StrangeActually she was quite powerful in AOU, she just didn't get enough screen time.
This is why I think someone else is helping her.
I think it's Apocalypse.
He came in and gave her that extra boost. He's using her to create his 4 horseman.
He already has 3
1. Fake Quicksilver
2. Wican
3. Speed
The 4th is Monica. Once she powers up, Wanda will put a hex on the entire world, the the final episode will end like this