<human>: Before I say anything, I'm on a budget. Everyone in uni is on a budget.

So a few hours ago I was sleeping. I woke up with some noise at my nightstand. It was My Cousin!!!!!! Searching through the cigarette pack that by then was almost empty, dunno why, this morning was almost full and i didn't even smoke that much throughout the day.
So, caught red-handed, she's like "Oh I thought this was my pack"

Since half asleep, only wide awake did I realize that she did it again. It wasn't the first time, once i left my pack in the kitchen and counted them, some were missing. I also told her about those incidents and she acted allll insulted....

Thiis time I confronted her, through texts, since she was out. She was all offended that I could think such a thing about her, it was all so fake, and she was speaking in this pretetious mature matter, as if I'm a little kid or something and she's this sort of advanced human, which she isn't. Then she threatened both me and my sister that she will leave because she can't live in a place were she's being blamed. What a bunch of fking BS.

My only dilemma, is that I want you nice strangers to be on my side, and reassure this *points at self* female redditer has ballz to speak when she's being wronged, without going too far. My sister told me I exagerrated but my cousin's a fake bitch. She was gonna stay over for a full month, not contributing to anything, let alone rent, which is SUPER expensive. Also, one time in high school I had this awesome pair of pants, she actually gave them away as presents to her bestfriend, never apoligized, she actually manipulated me into feeling guilty for wanting them back from her bff.

Any other tips please?

Can you succinctly summarize the text in 1-3 sentences?
<bot>: My cousin steals my cigarettes, I confront her, she acts alll insulted the only possible person stealing them would be her, now she's threatening she will leave.