Mums diagnosis - tonsil cancer

Hi Guys. My mam got diagnosed with cancer of the tonsil about 3 weeks ago. They’ve been fast tracking her for all tests and scans etc. This week we’ve found out it’s grown since her first scan and is more advanced than first thought. Has anyone else being through this type of cancer? Any advice? She’s took on the Keep Calm and Carry On approach about it all and seems like she’s okay (infront of me anyway)  we’ve been given a rough plan of action and what treatment she is going to have. Thank you