If she can hear you - your mic is fine
The most likely cause would be her mic or your speakers - did you make your speakers default in Skype?
Vista
TEST SPEAKERS
Right click on speaker icon in System Tray or from Control Panel
Select "Playback Devices"
The speaker icon ( checked as working) and volume level graph should be visible
Right click on the volume graph and click "Test"
Left hand speakers followed by right hand should be heard
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