It's essential to approach such situations with caution and respect. Nonverbal cues can be ambiguous, and it's easy to misinterpret them. People have different reasons for their actions, and what you perceived may not necessarily reflect their true intentions.
If you don't know the girl well, it's best not to assume anything about her actions. She might have been adjusting her clothing, felt uncomfortable, or just happened to move in a way that appeared suggestive unintentionally.
Remember that objectifying or making assumptions about someone based on their body or actions can be disrespectful and inappropriate. It's crucial to treat others with respect and focus on building meaningful connections through communication and understanding. If you're interested in getting to know someone, try to engage in friendly conversation and learn more about their interests and personality.