We can use 'into' here to indicate the direction. She is moving in the direction in which she will be inside the house. We can also use 'into' when speaking about things of interest. So for example, if you enjoy playing the guitar, you could say “I am into playing the guitar.”

How do you use the word into?

The word “into” is a preposition that expresses movement of something toward or into something else. I made it into work a few minutes early today. The tooth fairy tucked the tooth into her pocket before placing a $1 bill under my daughter's pillow.

Where do we use into in a sentence?

We use into after verbs describing change: We've translated the course into six different languages. She changed into her swimming costume and went for a swim. They divided the cake into four pieces.