The way the wall is constructed makes me think it is load bearing but everything else around its positioning in the house makes me think otherwise. The opening you see in the middle of the wall was where a shower window was. I think they did all this framing just to accommodate the window frame and nothing else.
- It runs parallel with joists
- It is a partial wall
- it is adjacent and perpendicular to an exterior wall
- there is no wall or anything of significant weight above it upstairs (Master Bath is 1st floor)