"Two roads diverged in a yellow wood...
...but because my travelling companion and I weren't talking about the trip we ended up in completely difference emotional places."
There's a very real possibility that you are into her, she's not into you, and one day it just ends and she's moved on and you're left nursing your wounds because it was more to you than it ever was to her.
You've laid your cards on the table, and she's laid her cards on the table, and it turns out you're each playing a different game. At this point one of you is going to have to switch games. Given your goal:
I ... want things to continue.
Then the answer to
Should I bring up exclusivity again or wait a while longer?
is no, you shouldn't bring it up again. You want to learn her game and play it. She has explained she's not interested in your game.
If your goal is exclusivity, then you need to be willing to walk away from the relationship (such as it is) and bring it up again, knowing that you need to move on if she's not interested. You can't keep playing two different games because your game eventually requires sacrifice on both your parts, beyond just time. It may be fun to stay in a relationship you know is going in the wrong direction, but you might find (perhaps to your surprise) that you become bitter or depressed since your emotional needs will not be fully met.
It's possible, however, that continuing down the path of "We're not exclusive, but we spend 1/7 of our waking hours together, exclusively" may ultimately develop into something more. Just don't plan on it, or expect it to, and always keep in mind that this relationship is "at will" and either of you may end it at any time for any reason or no reason, and any disappointment or sadness you experience will be of your own making.
Keep in mind that you've taken the relationship about as far as you can without giving up something else in your life. One of you has to move closer to the other, giving up job, friends, etc. She may have interpreted your discussion as "I'm ready for the next step" which is sacrifice, but you may simply want some assurance that she isn't dating other men. At this point, though, I'm not sure why it matters. Until one of you says, "You are important enough to me to give up my current life so I can share more of life with you..." then you've both taken this about as far as it can go, given the distance. So there's little reason to pursue further discussion unless it's to suggest you're ready for that step and to find out if she'd be interested in more if you weren't asking her to sacrifice much of her current life/lifestyle.