"I had my official last chemo treatment," she said. "And while I'm hesitant to say I'm cancer-free - maybe that's common for people who have had cancer - I'm doing great. Everything is moving in the right direction. I am very excited."
The 39-year-old broke the news in December that she was battling stage 3 choriocarcinoma, an aggressive form of uterine cancer. Arnold said the cancer was the result of a non-viable pregnancy in August. Over the summer, Arnold discovered she was pregnant but when she went to the doctor for an ultrasound, the baby didn't have a heartbeat.
She told People that doctors removed the embryo but the remains cells sparked the cancer. Almost immediately after her diagnosis, Arnold began a chemotherapy treatment.
"It actually got harder as more time went on," Arnold said. "Some weeks were more difficult than others with different side effects. I had a bit of a fatigue and nausea and some days it just felt like my hands and feet were very heavy."
According to People, now that Arnold is in remission her blood count levels will be monitored weekly to ensure the cancer doesn't return. As time passes, they will only be monitored monthly and eventually yearly.
Arnold, who is a neurologist at Texas Children's Hospital, told the magazine that her husband, Bill Klein, and two children, Zoey and Will, helped her get through the rough times.
"Bill knows when I'm not doing well and he takes such good care of me," she said. "That was huge. That and enjoying watching my children play was a huge uplifting part of my treatment. With kids running around, you don't have much time to feel sorry for yourself."