Dreams involving social settings, like your restaurant scenario, often reflect your current relationships, desires, and inner conflicts. Here’s a breakdown of your dream:

1. Restaurant and Ordering: This setting suggests a desire for connection and nourishment, both emotionally and socially. Ordering for your friend's sister may symbolize your wish to please others or to navigate social expectations, especially since you have feelings for her.
2. Confusion About Her Order: Not understanding what she wanted could reflect uncertainty in your feelings or in how to approach your relationship with her. It might indicate that you’re unsure about how to express your feelings or how she might respond.
3. Poker Game: The poker game with your friends represents risk-taking and strategy in your social life. Your reluctance to join could indicate a fear of taking risks in your relationships or a recognition that the current dynamics may not be favorable for you.
4. Friend's Yelling about Madelyne: This element suggests external pressures or judgments you might feel regarding your social interactions. The mention of a girl you don’t know could symbolize your concerns about being perceived as overly flirtatious or your fear of being misunderstood in your relationships.

Overall, this dream seems to highlight your feelings of uncertainty in navigating social dynamics, particularly with someone you have a crush on, while also reflecting your awareness of how others perceive your actions.

Advice: Consider how you communicate your feelings and intentions to others. Clarity in your relationships can help alleviate some of the confusion you feel. It might be beneficial to reflect on what you truly desire in these connections and how you can approach them more confidently.