It was my co-workers last day yesterday and I didn't get a chance to ask her for her number. She seems cool and I would like to get to know her better. We are acquainted, but do not know each other well. She always looked bored at work, so I made it my mission to make her smile or laugh every time we worked together. I have no social media, but I do have her number from our work schedule which the company posts in case anyone wants to switch shifts. I know that might come across as creepy/stalkerish, so I'm hesitating to text her, should I just let this one go?