What do you mean "consumer rights" after warranty expired? No law I know off will pay for a hard drive replacement after the warranty expired.
If the warranty on the system is over, she'd have to buy a new hard drive and install the OS on it herself. Although from the posting it seems she'll have to hire someone to do that. Either way, make sure your data is backed up as you have a good chance of the drive totally failing and you losing all of your data.