Girls, if you don't reply to a guy's text what does it mean?

Anonymous
This is the situation

I've been talking to this girl for a while now and I just got her number a few days ago . Two days after that I texted her asking "Hey , are you coming to the park today ?" ( We both run at a park and this is where we met ) . I didn't get any reply from her and it's been two days .

1.Girls , when you don't reply to a guy does that automatically imply you're not interested ? Or maybe she read my message when she was busy and forgot to reply later?

2.Girls , in this situation would you advice me to send a follow up message asking why she didn't reply or do I wait for the next time we meet face to face ?

3.Should I just behave normally when I meet her or ask her why she didn't reply ?
Girls, if you don't reply to a guy's text what does it mean?
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