When Kamala first put on the bangle, you can see shades of people for a brief moment. And on the right you can clearly make out a train track, before she's transported back. Those have to be the shades, but she can see them clearly now. That's why I'm not so sure yet she went back in time. Wouldn't rule out a dimensional shift and that's the reason Yusuf said Aisha disappeared that night, along with many others.
I think Kamala will at least witness Sana's trail of stars (as you suggest, perhaps creates it). In addition, I predict Kamala will witness the death of her Grandmother at the hands of the Clandestine. The villains are purely villains, but the woman leading them is selling it for me; she really seems like she went nuts decades ago, and now she is lashing out at the entire world.