Lets say I got the number of a girl I wrote over Instagram.

We talked a bit and I arranged the logistics for our meetup. Lets say railway station(big in this city). I didn't add where there because I wanted to do that 1 day before we meet.

Since then I didnt write to her for 2 days. Today I only added that we are going to meet tomorrow at this specific location. She only read it and didnt answer.

My question is if I should add a "okay?" later today or just wait until tomorrow and see if she's coming or not? Because it could also be because we didnt write for 2 days making her think I'm playing around with her.. or has lost interest because of it.