I also haven't seen some on your list 
Yes, I think she was as good as an actress when she was young as she is now. Good instincts, I guess though she has improved on her technique tremendeously (see her great performance in Cach). I don't consider Three colors: blue as highly as most others, as I don't like the character too much, and the performance was at times too intimate/personal (not a performance anymore) while I felt that she held too much back in other scenes. I liked the restrained "touch" much more in "The Horseman on the roof".