We had argument cause she added my friend on snapchat. Now We haven't spoken in 2 weeks?

Hi,
So about 3 weeks ago I told this girl that I liked her and she told me she liked me too but wanted to slow things down. I agreed and told her to reach out to me when she was ready.

A week goes by and she contacted me eager and happy to talk. We had a good conversation and it ended well. The following day my bestfriend and I spoke, and he told me she added him on snapchat. She didn't speak to him however.

It left me wondering then what this girl was doing, as I see she also likes his instagram posts. Now, this girl likes a lot of guys posts on instagram, which In my opinion is not a problem or a big deal. Nearly ever girl does this. When I confronted her about this I asked her did she like my friend. She said like is a strong word, I don't know him. He just looks nice. I then asked her did she add him on snapchat to which she said yes, but that she didn't talk.
I took this quite negatively and just told her that I thought she was different from other girls. She responded with ;
Am I like them?
Just because I added?
Anyway that doesn't justify how I am.
But OK.

We haven't spoken since 11 days ago.
The problem is that I really like this girl and I think I overreacted. I'm not sure though.

Any help would be greatly appreciated.
Updates
+1 y
We spoke and went as follows;

Finally after 11 days I decided I was stupid and stubborn enough and reached out to apoligise. I got cold feet, but she knew I was online and typed a? In snapchat to start the conversation and to let me know she was there.

I said:
I know we haven't talked in a bit. I am very stubborn and stupid at times. I was focusing on the wrong thing and I misread the situation. I wish I could take back what I've said.

I'm sorry.

Updates
+1 y
She responded;
Hi, everything you said I knew wasn't true about me, it's not because I talk to your friends, that I'm just like girls, I know my character.

I responded with;
I got it very wrong. I sincerely apologise.

End.

I know I've fucked up.
Is time my only chance now, or is there anything else I can do. I'd like to know from if you think there's anything else todo on my end?
We had argument cause she added my friend on snapchat. Now We haven't spoken in 2 weeks?
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