My roommate studies and has hours-long phone conversations inside our shared walk-in closet. Do I need to knock to go in my own closet? Note that this girl moved a suitcase from underneath her bed to the end of it, so a chair that I brought to share wouldn’t touch her end of the bed. And left sticky notes saying “Dishes max. wait time: 1 hr.” on the sink without actually telling me anything. And turns out all the lights while I’m reading or something without saying anything, if she’s about to go to bed. She says that she’s being “direct” by doing all this, but I think she’s just being a passive aggressive child. I would’ve made the adjustments if she had just told me that she had a few minor problems with things. I can deal with petty. I can’t deal with petty and passive aggressive.
Agreed…passive aggressive.
The semester is almost over…this is not too bad a situation. You can make it through.
She is giving herself privacy and keeping the noise down for you in the closet…
What I would do is tell her: " I just wanted to let you know that sometimes I need stuff from the closet when you are in there…so I am just going to knock and then come in get what I need and get out."
Also you could tell her : “When you are going to go to sleep, could you just let me know you are going to turn out the lights so I am prepared? Thanks!”
Cuz she has the right to sleep at a reasonable hour, but it would be nice to get a heads up.
Yes the note may be somewhat PA…but why not just clean your dishes?
When does your school year end?
Buy a lamp/clamp light, wash your dishes or use disposables. I agree with @bopper about how to handle the closet. I had a room mate from hell first year and never had to speak to her again after that. School should be out soon.
She might be on the autism spectrum – social cues aren’t super obvious to some people in that situation. I wouldn’t assume that she realizes how other people might handle these situations.
Sounds like her needs for personal space are greater than your own. Just mention casually that when you need to get something from the closet when she’s in there that you will knock and wait for her to answer before going in (don’t have this conversation while she’s in there).
And wash your dishes. It’s the right thing to do. 
Hopefully you have a new roommate lined up for next year!
She clearly needs her space and you’ll probably never know why. The semester is almost over. As to the closet I’d tell her you will knock before entering when she is there-- it is a shared space so I don’t think you need to wait for permission to enter. And just wash your dishes rigbt away for the rest of the school year and avoid that conversation.
People who would never dream of acting this way with their families do so when living with strangers. I cannot believe that there are this many regularly weird people in college, so it must be a phenomenon of trying to cohabitate with someone you don’t know.
That being said, she IS being passive aggressive and rude (I don’t think we need to diagnose her with some sort of social disorder with what little info we have) - that doesn’t mean you have to be. You can be direct about the closet (all have suggested the same thing I would do - knock and remind her that this is shared space) and the lamp (yes, I would ask her to please check with you if she wants to turn off the light/get a clamp lamp). As for the dishes, wash them or set her expectations (I’ll wash them in a bit or make sure they are washed before lights out at night or something). This battle might not be worth fighting - just do 'em immediately if you can.
More roommate misery comes from poor communication than anything else, and most often it’s because the receiving end of the weirdness is too afraid of/uncomfortable with confrontation to verbalize a problem. It festers, and then EVERYTHING the “offender” does is grating and annoying and gets blown out of proportion.