If you want her... strike up a conversation with her... break the ice..
If not... then delete her username... easy as that.
Waiting around for her to figure out what's going through your head isn't going to get you anywhere, because she simply may not really know what you're thinking. Just like right now, you don't know what it is that she's thinking... so it would be best for you to either just ask how she's been or forget about her... rather than do this silent treatment bs - waiting for the other to cave first. Sounds like pride is getting in the way for both of you...
"The weakest soul, knowing its own weakness, and believing this truth that strength can only be developed by effort and practice, will, thus believing, at once begin to exert itself, and, adding effort to effort, patience to patience, and strength to strength, will never cease to develop, and will at last grow divinely strong."
- James Allen