Episode 97 >.<
its episode 87
Episode 60
In episode 42.
Episode 43 tetsusaiga breaks
She appears in Episode 68 (from Season 3), entitled "Shippo Gets an Angry Challenge."
There are few episodes when that happens ;) It's cuz he likes da girl. Anyone can see that. Lolsz
Episode 66 - Naraku's barrier, Kagura's decision .
Rin gets attacked in episode 35
Sango never actually 'looses her mind'. she gets completely distraught during episode 50, that unforgettable face, over her brother Kohaku and almost commits homicide/suicide over him, then in 100, fight in the forest of despair, where she was in the coccoon of the moth demon, and saw an illusion of kohaku killing her friends (not real!). Finally, sango gets drunk on the mist of sages, as it is what appears to be sake in gas form. She then attempts to kiss InuYasha, and leave the others behind, then finnaly beat the snot out of miroku in episode 135, the last banquet of miroku's master.
It was in episode 24 where Inuyasha, Kagome, and shippo met Sango..
Epoisode 19; Go Back to your own Time, Kagome!
If you mean possesed than it's episode 60 - 61 she gets possesed by tsubaki. She also get's possesed in Inuyasha the movie.