You're not overreacting; a large part of relationships is what you're comfortable with, what your boundaries are, and whether the other person respects them.
You might not have known this was a boundary for you before, but you just figuring out that you're not comfortable with how this person is speaking to you (whether that's because this person ......
Do you remember if she reincarnated because she died in the modern world, or was she always a part of the historical world she reincarnated in? Did it show you what she looked like beforehand? Also do you remember if it had a lot of chapters?
Try Haroun and the Sea of Stories by Salman Rushdie.