My co-worker's possible crush on my cousin... Should I keep it to myself?

Well, if you think they could like each other, I say mention it to your cousin. ^_^ It does sound like she's interested. But is too scared and hesitant to say anything. I think maybe you should wait until you're bursting to let it out before you tell either of them. This is complicated. Love is complicated. And hopefully, if they do like each other, things will just come into place, and fate will take over. ^_^