In story telling, the reveal is a classic tool. It can be the classic a character opens their eyes or a detective presenting Mr. Body was murdered in the Billiards with the Lead Pipe by Col Mustard in front of the entire cast

Hope has been blind nearly the entire series. If she gets her sight back, what does she "see"?

Does she recognize a character she has not been able to recognize by voice or context?

Was it just to prevent her from writing a journal and if she can now write a journal someone pulling all the journals together will "see" something? Remember, Tanya told Saul to keep writing in 37-1. My guess is she will do the same with Hope.

My gut tells me that she was at the Water Works. When the other tower falls there were people at the pumping station. That would be a good rally point to initiate the counter attract on the Arena and/or a retreat away from the arena before going to the colony.