Tarrant County Sheriff s Office/AP
March 24, 2016 01:40 PM

Sofya Tsygankova, the Texas mother charged with murdering her two children, pleaded not guilty on Wednesday, PEOPLE confirms.

Tsygankova, 31, is the estranged wife of renowned Ukrainian pianist Vadym Kholodenko, 29. The bodies of the young girls, 5 and 1, were discovered by Kholodenko when he went to pick them up the morning of March 16 at her suburban Fort Worth home.

Kholodenko found his daughters dead in their beds while Tsygankova was covered in blood with stab wounds and rocking back and forth, an arrest affidavit obtained by PEOPLE states.

According to the affidavit, Kholodenko called police to report the murder and described his estranged wife as “going crazy.”

Nika Kholodenko (left) and Michela Kholodenko
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Police evidence allegedly suggests the girls were smothered with pillows.

When policed questioned Tsygankova, police say she seemed to have no memory of her alleged actions: According to the affidavit, she allegedly asked police, “Did I do anything bad to my kids?”

The affidavit states that the day before her daughters were found dead, Tsygankova visited a local mental-health facility. The 31-year-old mother allegedly has a history of mental health illness, the affidavit states.

According to the affidavit, police allegedly found medication for depression and anxiety as well as an empty bottle of Quetiapine, an anti-psychotic drug.

Tsygankova was taken to the John Peter Smith Hospital before she was moved to the Tarrant County Jail on Tuesday, where she awaits trial.

The girls’ father, who won gold medal at the 2013 Cliburn International Piano Competition, issued a statement on Friday saying, “The loss of my children will be with me forever,” he said. “But I would like to say that I feel the support of the Fort Worth community and all people who are sending me messages all over the world. Wherever I go after this tragedy, my heart will stay with the people here of Fort Worth and my daughters will rest in this soil.”

Tsygankova’s lawyer, Joetta Keene, told PEOPLE she has no comment at this time.

In 2008, Keene represented Texas mom Valeria Maxon, who was found not guilty by reason of insanity in the drowning death of her 1-year-old son.

With reporting by DARLA ATLAS

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