Due to the fact that she is favoring one side, and 'sometimes' dragging both back legs, leads me to believe that she may have an injury to her hip. This could've been caused by her wiggling around while being held or grabbed. There is a chance that there could also be nerve damage to her hip, or even her back.
Another possiblity, especially given her age, is that she suffered a stroke. These are common in guinea pigs and small rodents, unfortunately. The symptoms usually appear as leaning torwards one side, and loss of mobility in the hind legs.
Unfortunately, either possibility really needs to be checked out by a veterinarian. Any time an animal loses mobility in their hnd legs, indicates that something severe is going on. A veterinarian will need to examine her in order to diagnose, or rule out, any potential illness she may have, and determine an appropriate course of treatment.
Hope this helps!
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Always check with your vet for any symptoms your pet exhibits.
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