No response after casually asking for a coffee date via text? Input greatly appreciated!

fly_shy_guy
Read last 2 paragraphs for the main question.

So I met this girl in my class 1 week ago and we got together pretty well and I got her number. A week later I ask her to save me a seat but she doesn't read the text until later so I end up sitting somewhere else. (she did say sorry that she didn't read it)

Seeing as 1 week already passed (class is once a week) about 5 hours later I text her saying that she seemed cool and we should meet over coffee (I don't want to wait a whole week before I see her again).

So it's been 2 days with no reply so far. Should I just call her and plan the date by phone? I'm thinking that the reason for no response is that I texted instead of called her so if I call she'll answer and go. The thing is if she doesn't pick up that'll make me look more desperate. Any help appreciated.
Updates:
+1 y
To any girl reading this - Please just text that you're not interested instead of wasting the other guy's time, thank you.

Oh well, at least I've learned that texting is a horrible way to ask out and not to get emotionally attached so quickly.
No response after casually asking for a coffee date via text? Input greatly appreciated!
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