it looks like metal yes
No her whole skin is just metal and the metal skin doesn’t have much to do with her powers
As for a weak spot it’s the heart. You know where a heart is in your body.
And her powers are super agility so like she can climb walls and sit on ceilings and psychokinesis
Her skin is metal because she ripped off her normal skin as a child and somehow survived it. She was rushed ti the hospital where her skin was replaced with metal.