She had the strength to survive and still smile and give her girls the love of a mother and attempt to educate them when she only had a 5th grade education. When push came to shove when they all showed up, she held her ground and did not waiver until Mr. G gave it up and they told her. No, she has a strong personality. It will take time for her to not want to see them again even though she knows what they did.
Personalities are partially there at birth and firmed up in the younger years. The teen years just clarifies the personality. She was a happy child and the abuse she went through did not destroy that. IMHO
im sure if she was making noise about seeing them it would be all over the place.