"A seemingly insignificant comment in passing. Something like "Hey Spinnet, you look great today" for example. Give her a sincere compliment, but keep it casual like it's no big deal. It doesn't have to end up in small talk, you just want to get her attention, right? Then, next time, ask her opinion on something when the topic is relevant. Show her that you care what she thinks. Just try to be present, you know, and then you'll see if she notices."