Perhaps she's catching up with other old friends and family since shea moved back recently...

Or maybe your silence made her think you two no longer have much in common...

Unless she knows you to be the silent type, then idk.

I've slowly drifted away from friends who I've felt we no longer shared much common ground, it was just a natural ending of a friendship, or a beginning of a new dynamic. It wasn't personal.

If you really need to know though, call her, ask her if she's ok and if there's a specific reason she hasn't been in contact.