Explain this Body Language?

Okay well maybe her pants are a little big she forgot a belt....maybe she was saying it in a flirting tone so you would do whatever for her because she didn't want to do it (girls do this all the time whether or not they like you) Girls know guys like to lift stuff do stuff show off in front of girls and girls use that to their advantage. If she is flirting with you she would prob touch her hair alot, touch ur arm/ur shoulder, laugh at ur jokes even when they're not funny. She'll take an interest in u as a person and ur activities.