Kamala had a vision of the past (the 1947 Partition of India).
It's not a vision of a different dimension. Kamala had a vision of the 1947 Partition of India, at the train station where Sana (Kamala's grandmother), Hasan (Sana's father), and Aisha (Sana's mother) were fleeing to Pakistan. The "shadowy figures" in the episode 1 vision were the huge crowd of people fleeing to Pakistan.
In episode 2, Kamala had another vision while wearing the bangle, but this time, of a woman gesturing at her. That woman was Aisha (as revealed in episode 5). In episode 3, Kamala had another vision, of a train with a sign that says "Karachi".
Sana: Did you see the train, beta? [...] Because I saw it too.
- Ms. Marvel S01E03
Kamala (to Sana): Nani, is it the same train? The one that we're seeing in the visions? Is it that train from that night?
Sana: Yes.
- Ms. Marvel S01E04
The visions Kamala had in episodes 1, 2, and 3 were visions of being summoned back in time to the train station by Aisha (through the bangle). Aisha summoned Kamala (as revealed in episode 5) to guide Sana (who got lost in the crowd) back to Sana's father.
This time-travel summoning is a causal loop, as Kamala ended up guiding her own grandmother ("she followed a trail of stars") to her great-grandfather, allowing them both to safely flee to Pakistan.
Sana: [...] when the bangle was used the last time, it saved my life.
- Ms. Marvel S01E04