My one roommate is falsely accusing me and my other roommate of things we haven’t done. What do we do?

TsundereMatrix
I have 2 roommates. One I went to college with and we get along well. Let’s call her S. The other one moved in not long ago. Let’s call her J. Me and S are roughly the same age (26 and 27). J is 42. S has 2 cats and I help her care for them. All was good for a while until we noticed that J started to ignore us more than usual and being snarky towards us and to the cats. Just tonight she started going off on me, falsely accusing us of things like not doing the dishes even though she never does the dishes and that we are abusing the cats because their litter is not being cleaned and she’s going to have animal control take them away even though S cleaned it yesterday and then she accuses me of stealing her weed pipe from her room. I smoke weed on rare occasions and I’ve never been in her room. She basically said she’s done with our “white trash bullshit”. I can hear her talking to the cats like “you guys are little shits”, “you fu*ks are on the counter again?”

I’m going to talk to S tomorrow about it and maybe bring it up with our landlord? I don’t know what to do at this point. I don’t have anything to prove that these accusations are false. When she moved in she did say she’s not a cat person. Why move into a place that has cats if you don’t like cats?
Updates
+1 y
My other roommate S just told me that J had a guy over a few times. I was away for 2 weeks and I didn’t know so we think that maybe he is the cause of her drastic mood swing.
My one roommate is falsely accusing me and my other roommate of things we haven’t done. What do we do?
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