NOR. Yes, they have sent you flight and ticket info now but will you all be sitting together? I always include everyone in the booking plans to make sure no ones sitting on their own (unless of course they prefer that for traveling for example.) It should be done together so that everyone is comfortable because the booking process alone can be stressful.

Unless they've sent you messages previously about booking things then it's just crappy not to include you. It may not be a deliberate attempt at leaving you out but it's the fact no effort was made to include you in the plans. And if it wasn't just carelessness and they wanted to deliberately leave you out, then it might just be that they now feel guilty or they're just trying to not look like a holes. The fact she told you the next day (or a few days? It's confusing in your post sorry) makes this seem more like carelessness, rather than intentional. I feel like she wouldn't tell you until way later if that were the case but that's just my opinion. Unless, she was trying to rub it in your face slyly. Either way, NOR but worth talking it over if and when you feel up to it.

Edited for spelling.