How to Raise a Time-Traveling Girl

My royal sister caused me to break a leg, leaving me confined to a wheelchair, a crippled princess. So out of boredom, I raised a transmigrated girl as a plaything. She didn’t know any rules, and her courage was ridiculously small. Every day she’d whimper, “Why didn’t I read more novels? I kept studying medical books all the time…” I was frustrated too; this transmigrated girl was really clueless. Later, she healed my leg, and I sent my royal sister off to the Northern Barbarians for a marriage alliance.