Amelia Thornheart Book 1 by Keene

After years of fighting a terrible disease, Amelia finds herself transported into a mysterious world, right into the quarters of a demon captain! Free from her years of suffering, Amelia decides to face this new reality with optimism and cheerfulness!

Strangely, she seems to have a new body, retaining all the abilities of her game character she spent years leveling in the hospital! However, wasn't that character a demonic combat mage? Who's this pretty blonde human woman she's become!?

Well, never mind! Better not let the demons know of her titanic combat capabilities; instead, maybe her modest healing abilities could be provided as a service?

"Hang on! I'm not a spy, or an assassin!"