In reply to:

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When she trys to do this with mic boost ticked, her voice is clear but the rocording of the music is not, without mic boost ticked, music sounds great but u can hardly hear her voice

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Record the music without the mic boost ticked.

Then record the voice with the mic boost ticked.

All you need to do is click the record button when you play the audio.

Once that's done, click stop.

Get ready with the mic, click the record button and the first track will start playing and the next will start recording.

If it's not quite right, click on the little X on the left hand side of the track to delete it and do it again.

Check your settings in the record levels and make sure you select the correct sources for recording for best quality, as shown below. Good luck and let me know how it goes.