For all of the 14 years of her life, Gabrielle (Gabbie) Hoffman fought valiantly against the affliction that had been diagnosed four days after her birth in Suburban Hospital.

She willingly got up at 5 o'clock in the morning to clear her lungs of congestion so that she could go to school. She spent long periods without complaint in the hospital so she could get intravenous treatments.

The battle was lost on Friday when Gabbie died of cystic fibrosis at Georgetown University Hospital. She had become very ill and had been hospitalized two weeks earlier.

"Gabbie's active lifestyle is different from other children only in her more frequent visits to the hospital and her home therapy. But Gabbie, like most cystic children, lives in almost all other respects a normal childhood," the Northern Virginian, a monthly regional news magazine, wrote of her in August 1976.

The magazine's editor had dedicated an article on cystic fibrosis, a medical mystery that afflicts children, to the spunky girl.

Gabbie was able to complete six years at the Bells Mill Elementary School in Rockville and graduated last June from the Cabin John Junior High School there. She would have entered the 10th grade at Winston Churchill High School in Potomac this fall.

Special arrangements were made for her to keep up with ther classmates during the periods when she was in Children's Hospital and later in Georgetown Hospital.

She became a talented artist and many of her drawings hung on the walls of Children's Hospital. She and her brother, Benjamin, who is 9, performed with puppets and did magic tricks at both Children's and Georgetown.

They called themselve the "Magical Puppeteers" and Gabbie became known as "Miss Magic." They took their show to other places, such as the Jewish Community Center in Rockville.

Gabbie also played the flute. She belonged to the Teen Club of the Washington Hebrew Congregation. Each Saturday when able, she attended classes at the synagogue where she studied Jewish history and ethics.

"She worked tremendously hard to live a full life," her mother, Esta Lee Hoffman, with whom she lived in Potomac, said yesterday.

Besides her mother and brother, Gabbie is survived by her father, Lawrence A. Hoffman, of Orange, N.J., her grandparents, Rubin and Florence Hoffman, of Bethesda, and Hyman Geller, of Miami, Fla., and her great-grandmother, Sophie Langholtz, also of Miami.

The family suggests that expressions of sympathy may be in the form of contributions to Georgetown Hospital's Young Adult Cystic Fibrosis Clinic.