That to me sounds very sane, very fair and pretty much how I'd feel.
First off, from your account, you did NOTHING wrong. So don't go there in trying to work out if you somehow caused this. It all sounds very mutual on the first date. Clearly she's dealing with something, which is her prerogative. She might not be playing games, she might have had a genuine change of heart, and it's highly likely if so that it's for a reason that isn't about you personally.
Or she might just be someone who has this as part of her nature. I dated someone who was great when times were tough, but as soon as we got to a patch of clover dived down these "am I really the person I want to be, and living the life I want to live" rabbit holes. That soon saps your will to live. My experience is not to play into that dynamic because it quickly gains strength on the basis that with nothing to worry about, the other person tends to introspect even more.
Don't focus on her decision, that is for her to take. You don't have to be patient, because you're not waiting to see if you won a prize and you're not required to put anything on hold. You should focus on firstly carrying on with life. Unless you said otherwise that can mean dating too. And making your happiness independent on what another person decides. And second, focus on actually being fair with yourself on whether this is something you might have to deal with again in the future People don't tend to change much. Might be a one off, might be a pattern. Only you can decide what you're willing to accept.