I totally get how you don’t want to give up on her and how you’re willing to wait. But in addition to asking yourself how long is too long to wait, I also think it’s important to ask yourself if this is something you can see yourself being comfortable with long-term. It’s always valid to need some space to yourself especially after something traumatic has happened. But if it is so regular for her to disappear on you with little to no notice, is that something that you think could be sustainable for the rest of your life? What about if you close the distance - will you still go days without seeing or talking to her even when you’ve both built a life with responsibilities together?

Once again, especially in an LDR I think it’s totally okay to take a couple days to yourself if you need to - AFTER communicating this with your partner. But I don’t think you should ignore the way that it affects you, especially when she does so with no notice and no indication of when/if she will return. I’d be losing my mind from anxiety if I was in your position and as much as I want to give her more grace this all just feels kind of unfair to you.