If a girl is really mad at you and won't talk to you at all, will time maybe change her mind?

if a girl who is so mad at you for something that she told you don't call or text her anymore, will time maybe cool her off? if I apologize, (I don't even know what its for to be honest) will she maybe think it over in a week or 2 and then want to talk about it? or are girls pretty set when they are like this.
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yea it turns out she is mad because I talked to some friends of her friends on instant messenger about how hard it is to go out with her, and was looking for some advice, funny thing is she told me on our last date she's really hard to get to know..ironic
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i texted her about how sorry I was, that it was my fault and hopefully she can forgive me, she texted back almost instantly, not to worry about it, but thanks. should I try to ask her out again for a 2nd chance?
If a girl is really mad at you and won't talk to you at all, will time maybe change her mind?
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