According to The Age, Batt-Doyle was able to celebrate before she crossed the line, knowing the national mark was secure.
“I'm very, very happy. I feel a sense of relief because it's something I really felt I could achieve and it's been on my mind the past couple of years. I'm really proud I could achieve it today and I'm so happy,” she said.
“I think it's really validating for the hard work I've put in and it feels really special to be part of history.”
The Chicago Marathon is one of the world's major city marathons, and the result makes Batt-Doyle the fastest Australian woman over the distance on record.
Her achievement came on a notable weekend for distance running, with Eliud Kipchoge setting a Melbourne Marathon record on the same day. The Age's related coverage reported that the athletics great described the Melbourne track as the best he had ever run.