I can believe it
Try living in a small community like that and then having nobody to talk to, it would get overwhelming, you would become depressed, depression turns people suicidal more often than not and with the time frame of her mom being busy with selling houses, she had time to kill herself because she thought that was the only way out.
I live in a town of about 100,000+ people and back when my sister was 14 (she's 16 now) she was the victim of bullying like this. She didn't send any nude pictures or anything, she had a boyfriend who spread vicious rumors about her after they broke up and ended up sleeping with her best friend. For months they tortured my sister, on her Facebook page (creating fake accounts to harass her), through texts, laughing at her at school, leaving mean notes in her locker, etc. It took its toll on my sister to the point where my mom considered having her transferred to a different school. My sister would come home crying every day and no matter how many times my mom called up the school to ask them to do something about it or talked to the other kid's parents, nothing would get done. It wasn't until a really good police officer scared those kids by telling them about anti-bullying laws and what could happen to them, that the harassment eventually stopped.
Point being, that bullying like this can drive a person to kill themselves or want to kill themselves. So if you think stuff like this doesn't happen, then you're wrong.
You would think killing people would make them like you but it doesn't. It just makes them dead.