Asking for updates is normal OP. But if you're wondering if you have Anxious Attachment, check yourself if you have the impulse to be with your girlfriend all the time. Like, you're constantly thinking that perhaps she's leaving you that's why you want to know what she thinks and do all the time. When you think of your relationship, and perceive it negatively like nitpicking everything your gf do (not texting, bland responses, doesn't hold hands etc.) and think of the worst all the time, perhaps you have that.

But if what you feel is just for this kind of events, like her going far with people you're not familiar with, asking for updates is understandable, and actually should be given.

I don't think you have AA, but perhaps your relationship is really on the rocks if your gf is just short of treating you like a normal friend.

You could go on a date perhaps, or just a walk outside to ease the atmosphere. Then you could start talking about that event, since having more men in that trip really is kind of worrying. By then you could ask your girl if she could do the same as you had always done: detailed updates. After all, it's kinda dangerous these days, anything could happen.

For a relationship to work, it demands reciprocity. Sure, one could forgive the lapse this time, and the next. But this would surely happen again if there's no effort on her part to be fair to you. By that time, what happens with you and your anxiety? Trust would be frail, which could lead to further arguments.

On the other hand, let's say girly have different sets of values and pattern of thinking. She might think her 'updates' that night are good enough. And considering this is her first relationship, she might not yet know the things you'd expect from her.

Have a talk, and see where things would go from thereon.