I don't know, but my opinion is that her intentions don't really matter cause it doesn't change you you have to do.
Even if she is totally committed to trying, you'll have to show her what a great guy you are and that being with you is where she wants to be.
If she's not committed and wants to make some excuse it's the same deal--show her this is where she wants to be. If she sees that enough then she may change her mind and decide she does want to be committed.
Now, maybe these two situations would require a different approach from you, but I don't know enough to say anything about that, perhaps someone else will chime in.
One thing I'm pretty sure of: if you try to argue that she's just making excuses with the introvert stuff that's not going to get you anywhere. I know you said you weren't talking to her about that, seems like the right move to me.
Me: 43 W: 41 Together 2009, Married 2011 Sons 10 and 6, Daughter 5 Bomb 2/21/21. W moved out 10/2021