The Story of Raising a Female Supporting Role and a Beloved Concubine

Once she traveled through time, she turned out to be the cannon fodder female supporting character in the palace-fighting novel she wrote. But how come this original heroine was transported through time? And what's going on with this reborn person? Is it possible that time travel and rebirth are just like cabbage these days? But don't be afraid, I have a system. Let's see how the heroine became a beloved concubine in this deep palace.