The idea of moving, in and of itself is stressful. Trying to plan ahead and make new dreams, with another, feels rather vulnerable, I can relate to that.
Sounds like, you're ready, but also willing to do so independently. Getting your gf on the same page, is a huge leap of faith. Seems only natural that you are questioning her ability to commit to this, as you are. Sticking to a savings plan, is an action that speaks louder than words. Plus, her lack of effort with savings denotes a valid reason to doubt, or not trust her intentions.
How far out, timewise, are you both to moving?