MC tripped into the other world at the age of 11. She spend a few weeks wondering alone in the wilderness scared and barly alive. The first person she found showed her sympathy, gave her a meal and bed to rest on, and then promptly sold her off to a slave trader. She's been traded around a bit in 7 years and hasn't been able to really learn about much. Slaves aren't supposed to talk and she had enough trouble just surviving.
After she gets freed she knows she isn't safe since she hasn't been able to learn most of the common sense despite living trapped for 7 years. She lived shortly with the eccentric witch that taught her potion making skill but after the witched passed away she left to try and find a new safer place to live.
She understand the contrary ness of being freed from slavery and buying one herself. She plans on learning worldly knowledge and eventually free him once she knows she's safe. She knows she's simply to easy of a target at present time and needs someone who can't betray her until she's able to stand on her own.