When she received a fairly crude stick of a replacement hindleg from Ponyville hospital, she set out to make her own design, the results of which you can see above. As she took her first steps on her new limb, she decided she would devote her time to helping other ponies like her, and become a prosthetist.
Why such a human name?
Also, does the nurse pony in your icon have all her limbs? ;)
I guess you can call it that, after months of pain and annoyance of being stuck in bed feeling useless, there wasn’t much of a choice in her mind.
She was working on repairing the rear axle of a large cart when it slipped off the stand, and her leg ended up under one of the wheels. The break was really bad and after months of it not healing well, she asked the doctors to amputate it instead, so she could get back to work.