I think  what viters posted is what I would try... start with one light... the Sun outside the window
then render ... then add interior lighting one at a time after that, and render in between each added
light..think about where the light is coming from , ceiling light, lamp, or another room... I like to add light
as if were coming from another room to add depth to the picture... say like she left a light on in the
bedroom, or bathroom or where ever.. even from the kitchen area would be an option...
think about where the light would be in reality... and think about how dark it would really be if
the only light you had was coming from the blinds... even in the morning it would be very dark in the room
with no lights at all... As it is now in my house,  as I am posting this.. .
"Think Light" is a good analogy... put yourself in her spot and image where the light is actually coming from
be it other rooms.. other windows. other light fixtures.. and also play with the settings, intensity and such..
that also helps...