But DaCosta Ahern died on April 19 last year, before the gallery was able to pay the studio a visit. “She was just this quiet, but vivacious personality,” said Folsom. “Even though she was quiet, she would always challenge you,” added Flythe, “challenge your beliefs and challenge the way you thought about things.” Elizabeth DaCosta Ahern’s “O Mar Salgado” Handout/Courtesy Galerie d’Orsay On Saturday’s showing of DaCosta Ahern’s work, Galerie d’Orsay presented a thread from mentor to mentee. “Jump In! Celebrating the thread between student + mentor” features a few of Frankenthaler’s works such as “Causeway” and “Aerie,” around 30 of DaCosta Ahern’s paintings, and then carries through to some…