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Set the Format type to Mac OS Extended (Journaled.).Click on the Erase icon in Disk Utility's main window.When Disk Utility loads select the volume (indented entry, usually Macintosh HD) from the Device list.Select Disk Utility from the Utility Menu and click on Continue button.Immediately after the chime hold down the Commandand Rkeys until the Apple logo appears. Also, visit The XLab FAQs and read the FAQ on Data Recovery. The longer the hard drive remains in use and data are written to it, the greater the risk your deleted files will be overwritten. Beyond this or if the drive has completely failed, then you would need to send the drive to a recovery service like Drive Savers, which is very expensive.
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Recovery software usually provides trial versions that enable you to determine if the software would help before actually paying for it. Two free alternatives are Disk Drill and Cisdem DataRecovery. Each of the preceding come on a bootable CD to enable use without risk of writing more data to the disk. If you stop using the disk it's possible to recover deleted files that have not been overwritten by using recovery software such as MAC Data Recovery, Data Rescue II, File Salvage or TechTool Pro. In the future, she should leave at least 10% of the drive's capacity as free space to avoid this problem. I'm afraid you have no other alternative at this point. You can remove the drive and put it in an external enclosure so that you may try recovering her files with recovery software. None of her files can be recovered at this point. You will have to erase the drive and reinstall macOS.