Sasha would have (mostly) stood by Jon throughout the series and that’s why she had to die for the plot to work. In this essay I will - No but honestly, I think Sasha would have been a lot more open to the nonsense that happens at The Institute than Tim and Martin were.

She says in her statement about The Distortion that she doesn’t want to quit even after Michael had dug in her shoulder for worms simply because she’s “just too dammed curious.” Not to mention that she spends her last moments making a tape for Jon because “I know you’ll want to know what’s been happening.” Sasha has always been strongly connected to The Eye throughout the entire story, and that’s why I think she would have been in agreement with Jon that they needed to push further closer to the fears so they could understand what was happening.

However, while I do think she would have mostly been on Jon’s side until the end, I do think they probably would have experienced a strain on their friendship. Sasha scolds Tim in one of the tapes for recording Jon’s birthday party without permission because it’s an invasion of privacy. So I can’t imagine that she would have loved Jon’s powers, though I still think she would have been more curious about them than Basira was.

Overall, I think a Sasha that survived into later seasons would have Jon’s back on the notion that they had to understand what was going on, and considering that Gertrude thought Sasha would be the best person to continue her work, I think it’s a non-zero possibility that she would have been very invested in stopping the fear apocalypses as well. However that does leave me with a thought: What would Sasha’s dynamic with Tim look like Season 5 if she (mostly) stuck by Jon’s side and they both lived that long? It’s interesting to think about what would have happened there, and TBH I really wish I could eye-power my way to having a canon answer on that.