Hey Krush!
This is my suggestion, no routines planned out, just something easy and effective:
Next time you walk by a HB in your department, say "Hey, how's it going?" and ask them a quick question as you're walking by. She won't feel like you're tryna get into a conversation wit her cause you're both walking away from eachother. You get your answer and laugh a little, give a smile & say thanks. Presto! you've made a connection with her, you've put a smile on her face and you shown you're not needy of a conversation, but that you're not shy to talk. all that raises your value in her eyes and the game has begun.
Next time you see her, you can stop her & ask her for her name, introduce yourself & then continue walking away or start a converstation.
What is sure is that the next times you see her, you can easily start a convo, flash a smile & get one back, and then do your magic (figuratively speaking, or not)
Try that out man! And I hope the janitor doesn't mind you using his closet (if ya know what I mean
)