Babysitter Adonna Cheree Townsend, 28 (pictured) was arrested on Monday and charged with criminally negligent homicide

A Texas babysitter has been charged with criminally negligent homicide after a two-month-old baby girl in her care died of a Benadryl overdose.

Adonna Cheree Townsend, 28, was arrested on Monday when she turned herself in to Grand Prairie police as Johnson County law enforcement obtained a warrant to detain her.

It comes as little girl Emma Nicole Cox-Jenkins' cause of death on May 23 was confirmed as an acute overdose of diphenydramine by the Tarrant County medical examiner.

Previously, the examiner had only released the death had been ruled a homicide but newer details state the child passed away due to effects from the antihistamine, more commonly known as Benadryl.

Benadryl can be used to treat the likes of hay fever, cold symptoms, allergies and insomnia.

Emma Nicole Cox-Jenkins (pictured) died when she was two months old and the cause of death was confirmed as an acute overdose of diphenydramine, commonly known as Benadryl

Kayla Cox (pictured with baby Emma) went out of town and left her daughter in the care of her roommate on May 23. It was the last time she saw her baby alive

Kayla Cox, who describes herself as a 'Mommy of 2 and an angel baby' on her Facebook profile, received a phone call on May 23 to say her child was being rushed to hospital.

She had left both her youngest daughter and her son in the care of Townsend, who is her roommate.

In an interview with KXAS-TV (NBC5), Cox said she last saw her baby alive when she kissed her goodbye before going away for the weekend.

Now she carries her daughter's ashes around in a heart-shaped box that reads 'Forever in our hearts'.

Cox keeps her daughter's ashes in a heart-shaped box that reads 'Forever in our hearts'

Baby Emma's memory is being kept alive in a series of touching posts on Cox's Facebook page

'Emma...I miss you baby girl. I see all these other beautiful babies on my timeline and it makes me miss you even more. Mommy brought your ashes with her today cos I want you to be with me always!' she wrote June 10 alongside a picture of the tin on her Facebook page.

Since the baby passed away Cox has shared pictures in her memory on social media.

'I miss you so much my sweet angel,' she captioned one profile picture. Sharing another a week later of herself with Emma featuring an 'In Loving Memory' frame that includes a stuffed bear toy and baby's footprints.