I bought a house in the city, but a girl died in this house 5 years ago. She drank poison and died. Is it a haunted house? How to crack it?

Why drink poison? Suicidal? There will definitely be great resentment for committing suicide... then it may constitute a haunted house in Feng Shui terms!

For the cracking method, I suggest you watch "The Golden Taoist: Fighting Ghosts", a movie by Lin Zhengying.

Just follow the instructions... What are the specific details of taking photos of Tai Sui, asking the Kitchen Lord, worshiping the land, spreading gold and silver ingots, etc.!

Haha, in fact, there is a verse in the Buddha's verse: Bodhi has no tree, and the mirror is not a stand. There is nothing in the beginning, so where can it cause dust?

It doesn’t have much practical significance for you to do this, it’s just for peace of mind. . .