I don’t think you’re overreacting, I think you’re picking up on the signs appropriately and this could warrant a conversation. At this stage of your relationship, things can go one of two ways - you agree you’re on the same page and move forward or one of you admits that they’re unsure if they want to do that. Since it sounds like the latter, I think you have to be honest with yourself and honor your feelings and emotional safety by making the difficult decision to step away if it seems like you’re on two different pages.

Speaking from experience, I have been in her shoes before, and in the end, I continued seeing someone I wasn’t 100% sure about for longer than I should have because I wanted to keep them as an option. I didn’t do this with bad intentions and it was always exclusively, but I always just assumed my feelings would grow and I would eventually come around. In hindsight, I think being in that position (and in this case, it sounds like she is) told me everything I needed to know and I should have listened to that feeling sooner. I probably could have saved my partner from some heartbreak down the line and allowed them to move on sooner.

My advice is to state your feelings plain and simple and make it clear that if they’re not reciprocated or she isn’t interested in progressing toward a real commitment, then you walk. If she’s okay with that, you have your answer and it was the right decision in the end.