It’s been just over a week since Cathriona White, on-and-off girlfriend of actor Jim Carrey, committed suicide, and new details continue to emerge about her dark past. White, 30 at the time of her death, killed herself on Sept. 28, days after she and Carrey, 53, are thought to have split. New reports suggest her relationship with her estranged mother may have played a role in her death.

According to TMZ, White’s biological mother sent her a hateful letter on her birthday, which took place just days before she is believed to have killed herself. Friends told police she was called a “failure” in the letter, which left her feeling deeply hurt. Authorities also told TMZ White had a history of suicide attempts, first considering it in 2012 after the death of her father. The site claims her mother’s sharp words coupled with the third anniversary of her dad’s passing and her split with Carrey are being looked at as contributing factors in the suicide.

White is thought to have died from an overdose, mixing four different types of prescription pills. Ambien, Percocet, Propranolol and Zofran pills were reportedly found near her body. As was reported Tuesday, the pills were not in her or Carrey’s name. Us Weekly and People magazine reported the prescriptions were given by a doctor to an alias. Both publications reported that it is not illegal to obtain a prescription under a fake name as long as the person’s real name is listed somewhere on the medical records. The coroner has made the decision not to release the alias which was used to obtain the prescriptions.

Carrey spoke out about his girlfriend’s death hours after the news broke. In a statement he told fans White “was a truly kind and delicate Irish flower.” He went on to send his condolences to her friends and family, comparing the shock of losing her to “a lightning bolt.” Carrey was reportedly named in the suicide note White left stating that they had ended their relationship the week prior, on Sept. 24. He has since been spotted spending time with her family.