Don't read too much into it.
If she doesn't answer, she may be out of credit on her cell, she may have other reasons, like maybe her dog ate the cellphone, maybe she dropped it in the toilet, whatever.
The key is mostly to not nag her.
Don't come off as needy, because regardless how she feels now, if you start sending her 3-4 messages without her replying, you lose.
If she doesn't respond, you let her hang, and go out play with other people, then when she responds, wait a few minutes before answering her, and take it from there.
If she gets too much attention from you, the value of your attention will drop because she seems to have so much of it.
The whole thing about abundance at work here.
When you have abundant of something. It's not valuable to you anymore.
People who have tons of gold may decide to use it for shingles on the roof, or something, even though to others it's
...Gold!. To that person it's just meh.... gold, whatever. Don't fall for the temptation of trying to read her mind, and "know" why she does or doesn't do something.
You never will know exactly what her reasons are, so it's not useful to believe anything that may become an obstacle or a hindrance to your progress or your will and ability to push forward.