Everything has been going great, all of a sudden she's gone quiet

LPcustom100
So I've been seeing this girl for a few months, all was going well, she'd always make time to catch up and she'd contact me probably a bit more than I'd contact her. When we met she was really interested and initiated everything, she gave me her number. She has said a few things relating to 'us' and leaning towards being able to see each other more. So things seemed to be heading to a relationship so I asked her if she wanted to date. She wanted to and the next day she wanted to slow things down a bit just in case (there is actually a good reason for this, we’ve got big plans coming up), but said she really wanted to. She did say to call her soon about half a dozen times and she kissed me a few times before I had to go. Since then she's been quiet and 'busy', she has had a lot happen lately. It seemed like she wanted some more space. We've spoken briefly and she has contacted me on Facebook and apologized and said she'd call soon, but hasn't yet. I don't want to overwhelm her so I've backed off a bit. I'm not sure if she’s trying to tell me something, is testing me or what’s happening?
Everything has been going great, all of a sudden she's gone quiet
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