Jail records reviewed by Fox News Digital show Hemphill was booked into jail Wednesday afternoon before being released on a $10,000 surety bond.

According to the Fort Worth Police Department, firefighters responded to Cuddle Kids Dental after staff reported the 4-year-old had become unresponsive following the procedure. She was taken to a nearby hospital, where she was pronounced dead.

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📸 IG: began an investigation into this case," police said in a statement provided to Fox News Digital. "Upon their findings, it was determined by the investigators that an offense had occurred and that the doctor that was performing the procedure on the victim was responsible."

According to an arrest warrant affidavit obtained by Fox News Digital, Aithana's mother told investigators she felt rushed into signing paperwork before the procedure and watched as Hemphill handed her daughter a cup containing liquid medication, encouraging her to drink it before she was taken into the treatment room. 

Aithana's mother said she was not allowed to remain with her daughter during the procedure.

About an hour later, she was brought back into the room and found her daughter unresponsive while Hemphill attempted to wake her with a popsicle, according to investigators. Emergency crews were then called.

The tragic case has since prompted police to encourage parents to advocate for their children during medical procedures.

"The last thing you would expect as a parent," Fort Worth Police Department spokesperson Brad Perez toxic even for an adult.

As detectives dug deeper into the case, they consulted with the Texas State Board of Dental Examiners, reviewed the board's investigation and sought opinions from outside medical specialists.

According to the affidavit, Aithana received chloral hydrate, hydroxyzine and meperidine in addition to nitrous oxide gas. While each medication individually fell within recommended limits, investigators allege Hemphill failed to account for the powerful combined effect of the drugs.

Police also allege Hemphill failed to recognize signs that Aithana was slipping into respiratory distress and administered flumazenil, which reverses benzodiazepines, instead of naloxone (Narcan), the medication used to counter opioid overdoses. 

The affidavit notes no benzodiazepines were found in the girl's system.

Investigators also cited findings from a board-certified anesthesiologist, who concluded Aithana was not properly monitored during the critical recovery period after sedation and that the emergency response failed to address opioid-induced respiratory depression.

Perez told FOX 4 that Hemphill had no prior disciplinary actions and that her dental license remained active with the Texas State Board of Dental Examiners at the time of her arrest.

The investigation uncovered additional concerns inside the dental office. According to court documents, investigators found syringes containing leftover medication that staff allegedly intended to save for future patients, as well as confusion over where Narcan was kept during the emergency.

"Throughout this investigation I have learned from Hemphill's own statements, her staff's statements and from medical professionals, that there was evident neglect on Hemphill's part that led to Aithana's death," a detective wrote in the arrest affidavit.

For Aithana's family, the arrest comes more than three months after they lost what a GoFundMe describes as a "beautiful 4-year-old girl, filled with life and kindness" whose presence "always lit up a room."

"She was sweet, loving, and touched the lives of all who knew her," the fundraiser says.

It adds that donations will help cover funeral expenses, support her grieving parents and bring Aithana home to Mexico for burial. 

She is survived by her parents, an older sister and a younger sister.

The Tarrant County District Attorney's Office confirmed to Fox News Digital that Fort Worth police submitted the case Wednesday and that prosecutors are currently reviewing it.

Fox News Digital has reached out to Hemphill's attorney and the Texas State Board of Dental Examiners for comment.