Well the recovery partition says it has a maximum of 7 gigs. which has 0% of that left right now.
this makes perfect sense
the recovery partition is a portion of the hard drive used by certain manufacturers,[Dell, HP, and others], to provide a system to restore the computer to the state it was in when it left the factory. This system is normally invoked by either pressing a key as the computer is booting up, or by use of a special disk, [CD, DVD], which is inserted into the drive and the computer started up, this system can also usually be started from within the normal windows system.
the C: drive is normally what is known as the active partition and would normally boot automatically when the computer is switched on what may have happened is that when your sister attempted the recovery process something has gone wrong and the recovery partition as been set as the active partition.
if this is the case then you will need to use an off-line partition tool to correct this I can point you in the right direction to obtain such a tool and guide you through it's use, if you feel confident enough to attempt this.
it may be the case however that if we can invoke the recovery system that will solve the problem without the quite steep learning curve that the use of a partition tool would involve.
it is quite late here [UK] so I will be going off-line shortly if you can get as much documentation from your sister as you can I will be back on-line tomorrow and we can attempt recovery then.