Donna loves her mum, really she does, even though there are times she doesn’t much like her. Sylvia criticises her daughter endlessly, puts her down, acts as though Donna is a huge disappointment to her, and that hurts, but it’s just the way her mum is so Donna tries not to take it to heart. Some people don’t know how to be happy.
Her grandfather is completely different, always supportive, caring, encouraging, telling her she can do and be anything she chooses, and Donna believes him. She loves him more than anyone. Maybe her mother is jealous of their closeness.