Hugs, that sounds hard to hear, especially given your history, but even if that weren't the case. I think you're right with what she actually meant, but it's difficult to think about regardless and I'm sure many people would be triggered by it.

Be gentle to yourself, it's okay to feel the way you do and protect yourself. It's also great you've already told her right away that this probably wasn't the best comment, it sounds like she understood that. If you can reach out early somehow and feel like that's what you need, that's certainly a good option.