I took her "own flesh" to mean her family and those who share blood with her. Currently doing the Black Knife questline. Gonna see if it gives me more info.
Nah, it literally meant her body as an Emperyan. It's why she spends the whole game as a soul using a puppet.
In fact it increasingly seems like Marika might have played her? The knife she enchanted to kill herself is also the one used to kill Godwin.
Rogier himself is shooting in the dark, and on top of that is being manipulated by Those who Live in Death.