Lawyers for Grieg who made the call alongside fellow 2Day FM DJ Michael Christian, said she was "determined to address any questions surrounding her role in these tragic events as part of the inquest".
Jacintha Saldanha was found dead in nurses' quarters three days after she answered the call at central London's King Edward VII's Hospital, where Kate was being treated for severe morning sickness in December.
Ms Saldanha, a mother of two from Bristol, answered the phone and put the pair through to a colleague who gave details of the Duchess's condition.
Her death three days later sparked a worldwide backlash against Ms Greig and Mr Christian.
Today it was confirmed that Ms Greig is to give evidence at the inquest, due to be heard in London on Thursday.
A statement released through lawyers Slater & Gordon said Ms Greig had applied for and been granted permission to appear at the inquest.
"Ms Saldanha's suicide was a devastating tragedy and Ms Greig's thoughts have been with the family ever since," the statement said.
"Ms Greig fully understands their need for answers, which is why she has taken this step to appear as an individual at the inquest.
"She is determined to address any questions surrounding her role in these tragic events as part of the inquest.
"Ms Greig wants the family to know she will answer any questions the coroner or the family's lawyers may have at the inquest."
Last month, Coroner Fiona Wilcox granted anonymity for a duty nurse who may have been one of the last people to have spoken with Ms Saldanha on the night of the call.
The inquest, which will be held at the Council House Chambers in Marylebone, is set to hear from nursing and security staff plus police who can give details about the scene of the death.
A spokesman for Slater & Gordan said it is not yet known whether Ms Greig will give evidence in person or via video-link, and details have not been finalised.
Last month, after a pre-inquest hearing, MP Keith Vaz spoke on behalf of Ms Saldanha's husband, Benedict Barboza, teenage daughter Lisha and son Junal, saying: "They will never, ever come to terms with the death of Jacintha who they loved so much, but they hope this process will begin the healing process."