Hello, thanks for the quick reply!

The birthday I have is July 11, the year 1880-1883. She had an older sister named Susan born about July 1865, who married a man with the surname Saxe. Here is my transcription of the paper I have:
"In Her Majesty's High Court of Justice, Ireland
Probate and Matrimonial Division
(Probate)
Before the Right Honourable Robert R. Warren the Judge sitting in
open Court at the Four Courts, Dublin The 23 day of February 1891
In the Goods of} On reading motion paper filed the
Patrick Hegarty}
Deceased } 13 day of February 1891 copy affidavit
___________________}
of Mary Hegarty and copy exhibit marked "A" therein referred to copy
affidavit of John Lynch and copy affidavit of George Dillon all filed
the 13 day of February 1891. And on leaving Mr. Henry, Counsel for
Mary Hegarty, It is ordered by the Court that notice of this motion
be inserted as an advertisement in the Coleraine Constitution
newspaper once shall be deemed good service of such notice on Denis
Hegarty, Susan Saxe otherwise Hegarty, Martha Hegarty, Daniel
Hegarty, and Catherine Hegarty all in said affidavit of Mary Hegarty
referred to.
J.E. Proctor }
Solicitor }
47 Rutland Sqre }
____________ }