Keystore is just like pin code which encrypts user keys on browser and in future only keystore/pin is asked for signing transaction. This is only required if you enable checkbox to save account on device.
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Do you know what she can do if she already went through and ticked that box but now doesn't remember the keystore password? She has the private keys to her account still obviously.
She can try to clear browser cache, because keys are stored on browser encrypted with keystore/pin code. It should resolve the issue. For example, you can click on Cookies and remove relevant fields and reload page like on this image.