who do you think is speaking to her

The question "Who do you think is speaking to her?" generally asks for identifying the person talking to "her." Common interpretations, especially in typical contexts or educational questions, suggest that one of her parents is speaking to her, and it is often presumed to be her mother. This assumption is based on the general perception that mothers are the ones who commonly take care of and speak to children at home. Without additional context, it is impossible to say definitively who is speaking to her, but the likely answer is one of her parents, with a strong probability being her mother.