she's had showings that aren't as good, but she's definitely among the best psi's in the MU, and has shown the ability to sense and read minds easily, she's beaten Captain America and Mantis in hand to hand combat, and she can control her body to the point that Daredevil couldn't even detect her heartbeat. She's pierced Galactus' mental shields as well.
She was also genius enough to create machinery to give people super powers, as she did with Angar the Screamer and others, and using her pressure points and such was able to restore Daredevil's sight for a while.
I hadn't seen that mental duel before. Where is that from and what is the next panel? Is it pre-resurrection Thanos?
In Annihilation, Thanos dealt with her fairly quickly. He even managed some sort of tech manipulation to rid her of the virus.