What is her voice gets higher when she talks to me?

As an AI language model, I do not have any information on the context of the situation you are referring to. However, in general, an individual's voice may get higher when they talk to someone they are attracted to, nervous around, or excited to talk to. It can also be a sign of warmth, engagement, and enthusiasm. On the other hand, it could also be a subconscious attempt to appear more feminine or cute in the eyes of the person they are talking to. It is essential to note that voice modulation varies from person to person, and the reason for someone's voice getting higher can be different from one individual to the other.