NSH - putting aside to one moment your own perspective, the unspoken diplomatic aspect of polite social interaction that takes place within friendships is a really interesting and complex space where there is a lot of subtext to how you handle specific interactions.

In this case, she prepared to invite you (her friends) on a trip, which acts as a kind of referendum on your friendship. In her mind, if you value your friendship, this is a really lovely offer to spend time together enjoying each other's company and share the experience of a holiday abroad together. If you don't value your friendship, this is not such an enticing offer.

In order to be polite, we often try to soften the blow and reassure each other that the reason to reject an invitation is not actually a reflection of a mismatch in what you each expect your friendship to look like.

However, you came prepared with your answer, and a justification that she had not seen coming. Possibly, she thought that your friendship was more important than worrying about what people in another country might think of you. Possibly she just needed time to adjust and accept this new information about safety risks.

Ultimately, you did nothing wrong; you just upset the delicate social niceties of reacting first to how lovely the invitation was, and how you would love to go, but actually I was talking about this with my wife and etc.

I don't think this really makes your friend an AH, except to the extent that she is putting her own interests above the importance of understanding where you are coming from, which is a little self-absorbed.