When a girl (or anyone, really) says "Hm" in a text message, it's often a non-committal and ambiguous response. The meaning behind "Hm" can vary depending on the context of the conversation and the tone of the person using it. Here are some possible interpretations:
Thinking or Pondering: "Hm" can be a way of expressing that the person is thinking about what was said or considering their response. It's a way of showing that they are taking a moment to process the information.
Uncertainty or Indecision: "Hm" might indicate that the person is unsure about how to respond or doesn't have a strong opinion on the matter.
Disinterest or Boredom: Sometimes, "Hm" can be used as a disengaged or disinterested response. It may signal that the person is not fully invested in the conversation.
Agreement or Acknowledgment: In some cases, "Hm" can be used to show agreement or acknowledgment without going into further detail.
Politeness: "Hm" can also be a polite way of acknowledging the message without giving too much away.
It's essential to consider the overall context and the person's communication style to better understand the intended meaning behind "Hm." If the response feels ambiguous, you can always ask for clarification or continue the conversation to gain more insight into their thoughts and feelings.