I understand reading IOIs from a cold approach. Because she starts off as a stranger and if she is all of a sudden liking you after 10 minutes, that's obvious.

But I've been testing out social circle game, where you already know the woman, she's either a friend or an acquaintance. I'm having trouble telling if these women are attracted.

They already "like" you, except not sexually. They'll give you "fake IOIs", which is they give us what appears to be an IOI, except they don't accept it sexually like a Day 2 you just met would. It's almost like if you made a sexual comment to a friend, and they just think you are joking.

Example, I have a woman who I'm "friends" with (never gamed her, but never let myself fall into the friends zone either). Now I am a bit more interested and have started teasing her and seeing if she will chase.

She easily plays along with my games, and already has expressed great interest in hanging out, including wanting to cook for me and have a movie night at her place. Except, I can't tell if my game is actually working and it's real attraction, or she's just playing around with me as a friend.

Kino her, and see if she touches you back. Hold hands is a good test. If she let go pretty quick, then she is uncomfortable with holding hands (friend-zone).
Smell her hair/neck. If she let you, without making jokes, then she is in to you.

She's in Europe for the summer so I can't confirm with kino. I'll definitely do that when she gets back though.

this happens to me also.. i have a huge social circle since im in a fraternity..

and from my experience.. if the girl shows the kind of COMPLIANCE that you're talking about.. movies, chilling, etc.. it means that there's an open lane for you to take your relationship with her to a more intimate level.

most likely than not... they've had a small crush on you but never said a word.. from my experience it happens ALOT! you'd be surprised how many girls in your social circle have a crush or are open to you talking to them in that way..