If her attention is primarily on anything other than you, and if she doesn't seem excited to be spending time with you, that's the number-one universal sign that you're not her #1 choice. If she: Is constantly checking her phone. Acts like there's somewhere else she needs or wants to be.
She may have good reasons for keeping a lid on her feelings for you. She's already in a relationship and isn't sure whom she wants to be with. She knows what she feels for you but doesn't want you to know just yet. She's ashamed of her feelings for you but can't help showing them sometimes.
Keep your gaze on the horizon while walking. Doing so makes you appear more approachable and sociable.
Don't be afraid to be expressive through your eyes. Widening them in surprise, or narrowing them when you're skeptical, shows that you're engaged and paying attention.
Touch her gently so you don't startle her. If you two get really comfortable she might even let you slide your hand down a little lower. Once she's comfortable with you putting your hands on her waist, grab her and swing her around. Then, she'll be facing you.
Shy girls tend to show their love through actions rather than words. Hence, if you see her offering help more often, it might be a sign that she likes you. If you are having a bad day and she is extra careful around you to help you escape that unfavorable phase, she may like you.
If she looks away really fast, or smiles, or blushes, she's into you. If she casually looks away and doesn't engage anymore, she's probably not into you. If she's talking to you and laughing/smiling a lot, she's flirting. If she's playing with her hair, she's flirting.
Keep your head up, arms open and your feet pointed in the direction of the person you are trying to attract. This subtly shows that you are focused on her and what she has to say. Avoid closed off behavior like crossing your arms, which keeps people out.
Lowkey flirting is all about plausible deniability. Maybe you're into someone you work with or perhaps it's someone in your friend group. Either way, you want to feel out the situation to avoid any potential awkwardness.
