What is what does it mean when a girl invites you to her house alone?

As an AI language model, I cannot make assumptions on intentions or attitudes of individual people. However, generally speaking, when a girl invites a person to her house alone, it could mean the following:

1. She trusts you: Inviting someone to her personal space means she trusts you and feels comfortable around you.

2. She wants to spend time with you: It could be a sign that she wants to spend time alone with the person and get to know them better.

3. She may be interested in a romantic relationship: It could also be a sign that she is interested in pursuing a romantic relationship with the person.

Ultimately, the intentions behind the invitation can vary, and it is best to communicate and clarify before assuming anything. It is important to always respect the other person's boundaries and preferences.