She maybe isn’t available as much especially if she had tough weeks. Maybe meeting weekly is too much for her (it’s quite often, I honestly can’t meet my girlfriends weekly, maybe bi weekly?). Maybe frequent texting is too much too.
She maybe doesn’t know how to bring it up. I’d suggest if she’d like to make get together events monthly? When I don’t see my friends, it’s not because I reject them. It’s just that I can’t!