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a couple more details, this is a girl who's been hurt before and used school and work to bury her problems away, who isolated herself and says she's a bit lonely but she won't let anyone in
You nailed the reason this is happening.
I'm a dude, yet I still feel a certain way when coming out of a long, emotional relationship. I usually have issues committing, so I back out of commitment-based conversations/activities that may lead to something deeper. Part of it is being scared maybe, but most of it is because its tiring to be in a relationship and we all need a break.
If she was scarred, then shes still carrying that baggage with her and can't fully act herself around you (this is separate to when you are actually together, because being with somebody that you like will give you a feeling of familiarity and support, thus she will be more affectionate).
In terms of texting/calling/maintaining contact, I think this is a case of "less is more."
I think its great that you are trying to building trust with her. What's the best way to approach it?
Always believe in the power of action. If you text her everyday yet are unable to see her, its pointless right? But what about texting her once a week, but actually being able to hang out with her once a week? That's a much better result right? So while I understand your way of keeping things fresh, sometimes you have to let her operate at her own pace, you just have to be that pace car that sticks around and provides some direction.
So what I'm saying is, temper the texting/calls but give the texts/calls a clear purpose: to see her again.
You can judge how she feels about you on that fact alone: is she willing to see you?
I also foresee a little more proactive texting/calling from her side when she sees you've backed off a bit. But thats ok, even if she thinks you are distancing, you are still trying to see her. If she can't handle this or doesnt respond favorably, you'll just have to chalk it up to "timing." Because most things are 95% predicated on timing.
I know you're eager, as I would be, but try to alter your strategy up a little bit and see what happens.
Good luck man