what does this sign mean girl sitting with legs stuck together (not crossing legs) and her legs and feet pointing towards me and also she was looking down most of the time

was she wearing a skirt? Then that's the reason why she was sitting with her legs together.
Generally sitting the the legs together means she's at attention, maybe looking for a sign to get away or do something you ask her to do. Could also mean she's really listening to what you're saying.

When someone points her feet at someone /something, then she will think that person is the most interesting thing in the room. If she is pointing them away from people, it means that she wants to leave the conversation. Changing topics is adviced.

Having her head down can mean she's being submissive or she disagrees with what you're talking about.