Send it man, it doesn't have to be a long love letter or anything, just say hey, I enjoy talking to you at work, since you will no longer be in office, I thought it would be fun if we went out for drinks, coffee, dinner or something.
Something along those lines, light, open to interpretation. Don't set anything in stone until you are sure about her feelings for you. Sounds like she's into you though, or at least willing to give you a shot.
Getting rejected happens, but it's way not nearly as bad as always wondering what could have been.
The kind that prey on peoples gullibility for profit.