ill tell you why this could have happened.
dont you guys remeber in vol 1 where we find out that elle and bill are a couple. Bill tells Elle he loves her very much and to come home and abort the mission.
See what i thought would happen in vol 2 is that i thought elle would have helped raise Be Be, so i thought if beatrix was to kill elle, be be might have been upset by this, because she could have been the mother figure for her while beatrix was in a coma.
thus would have made a very interesting ending. just imagine if be be was calling elle her mom and beatrix had to watch this, what would she do?
so i cant see why elle’s picture couldnt be in be be’s room, for frig sake, she lived there.