She isn’t making plans for the future.
If you look in your iPhone's calendar, are the upcoming months looking unusually devoid of commitments? None of her 200 cousins has a wedding planned, you've yet to confirm any plans for your accrued vacation days, and hell, you haven't even heard about one of those double dates with her best friend she usually forces you to pencil in each month.
It's possible she's overwhelmed at work or otherwise preoccupied; it's also possible she's plotting an escape and is hesitant to extend any invitations knowing she'll eventually have to rescind them. Or, even worse, she's too invested in someone new to realize she's been neglecting your shared social schedule.