My eggs are pretty spread out. Still need a plan of action for her though...I guess. Small update. This morning she pretty randomly texted me with a map and the words: "This the place where the climbing gym is, right?" After an hour I replied: "Oui, the coolest gym in all of Amsterdam/Holland! Ever been there?" Of course, no response till now (eight hours later). Frankly, I'm completely lost about what this behavior means and how to advance it to something that doesn't involve one text every two days. Soooo. Plan of action please
Texting oddly enough tends to work against you before a proper relationship. It gives people time to think, digest, and review. It doesn't separate you from someone else all that much or convey messages properly, and worse still... if you give an open question that has no tangible meaning that requires a response, you'll be left waiting. If you had texted, "Quick, I need the answer to the capital of Fiji to win $10,000. We'll split the difference." She'd have texted you back asap. What you asked her has no sense of urgency, especially if she is as busy as you describe so she might not text back or text back whenever she feels like it.
I'm not a long-time texter and all I can say is that I'm not a fan of it prior to something more committed. Keep it short, simple, and more goal oriented since all those great conversations you could be having can be bettered by associating it with your physical presence. Even a phone call is better really since you get around that planning and thinking of a text by going straight to building rapport.
When you receive a text, try more direct phrases that position you closer to your goal, that being that you want to go out with her and from there you want to express your interest.
Something like: "Looks about right. I'm on my way there in a bit actually, meet me at X in about an hour and we can go together. It really is the coolest gym in all of Amsterdam/Holland and I'll show you why."
Now you're a lot closer to your goal in one single message than anything. It doesn't have to be the exact message since I don't know what the timescale of events is but it shows the mindset you should have to get together, have a fun time, and give you a platform to ask her out.
Also consider what you're saying. From what I gather she is asking you where a climbing gym is, and presumably she would be asking since she hadn't been there, so asking her if she's been there is a bit redundant.
It's very difficult to give specific help since a lot of information is lacking. You may be able to get away with a second text that seems like an appended message to the first, which completely ignores the fact you said anything other than yes and then added something along the lines I mentioned however it looks like too much time has passed.
Another alternative is the phone call so long as you know she hasn't been there. "Hi this is X. I'm planning to go to the gym on Saturday and my partner fell sick. If you're still set on going I can show you the best way to get there. I'll need to know by tomorrow though so call me as soon as possible." Just remember to never follow-up this reasonable message with absolutely anything until a reply is had.
Otherwise sit tight and wait for a reply and then go and do something like what I outlined in the text. There are actually many potential paths to take in any given situation, but you have to be dynamic and well prepared for it. This is all the easy stuff, since her personality is the biggest thing to deal with. Again this is why one on one is the best form of communication a thousand times over.