Interpreting the intentions behind someone's actions can be challenging without additional context, but based on the information provided, it's possible that your coworker may be seeking your company or attention.
When your coworker pretended to be lost on the way to work and asked you to walk with her, it could indicate a desire to spend more time with you or to initiate a conversation. Sitting down next to you during the break and asking if you were leaving might be a way of expressing disappointment that you got up, as it may have been interpreted as a sign that you didn't want to spend time with her.
However, it's important not to jump to conclusions without further evidence or more interactions with your coworker. Different people have varying reasons for their behavior, and it's possible that your coworker's intentions were harmless or unrelated to seeking personal attention.
If you feel comfortable, consider having a casual and friendly conversation with your coworker to get to know her better and understand her motivations. It could be an opportunity to build a better working relationship and clear up any misunderstandings.
Keep in mind that workplace dynamics can be complex, and maintaining professional boundaries is essential. If you ever feel uncomfortable with any situation or believe that someone's actions are inappropriate, it's crucial to address the issue with a supervisor, HR department, or someone you trust in your workplace.