How long should I ignore her?

She was upset with me because I didn't confirm plans with her, so she said something mean about me that wasn't true. I left because of what she said. She called me many times (I didn't answer) and sent me long texts explaining and apologized. She often changes plans on me, so I have been ready to drop her for good.

It has been two days and I haven't responded at all.
How long should I ignore her?
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