Stage 2 cancer after hysterectomy

After having a vaginal hysterectomy, my Mom (mid 60's) went back to her obgyn for her hysterectomy follow up and was told she had Stage 2 cancer. Here is exactly what the Dr. said: "invasive adenocarcinoma. Invasion into outer half of muscle of uterus. No extension to outside of uterus. Stage 2". He wrote this down for my mom. How does this all sound to you? What does he mean that there is no extension to outside of uterus, yet he also wrote invasion into outer half of muscle of uterus? He said he thinks it can be treated with radiation. Her appointment with the gyn oncologist is in about 10 days. We would really appreciate any thoughts or insight. Thank you so much.