Maura Isles mentions a devotion to Leonhard Euler and an admiration of the mathematical constant 'e' (the base for natural logarithms). However, she mispronounces his name. She pronounces it as "yooler" (as if it rhymed with "ruler") when, in fact, it is correctly pronounced "oiler". Someone who was in awe of 'e' would surely know the correct way to say "Euler".
Dr. Isles mispronounces the mathematician's name Euler as "Yoo-ler" instead of "Oi-ler."
The character of Dr. Isles would never mispronounce such a name.