Isabella Strahan, 19, shared on “GMA” that she was diagnosed in October 2023 with medulloblastoma, a type of malignant brain tumor. READ MORE: http://tinyurl.com/435y92ft SUBSCRIBE: https://bit.ly/2Zq0dU5 SIGN UP to get the daily GMA Wake-Up Newsletter: https://gma.abc/2Vzcd5j VISIT GMA: https://www.goodmorningamerica.com FOLLOW:…