I'm going to assume that you can communicate with your parts in some way. If this is the case, would they be able to hear music or see/hear a movie? Would they hear you reading them a story or singing to them?
How about asking her what she would like or need from you to feel safer and more secure? Maybe your soothing voice is all she needs to hear to help her.
Those are the only ideas I have come up with so far. If I'm off base here, please let me know.
Wishing you well!

sabby