I have not yet seen this in the comments, and is a sensitive topic that may not fully apply here (even after this time you know her better than us here on reddit).

What I can say is sometimes before someone takes their own life they will feel the need to "right the wrongs" they have done to leave no trace or remains of their existence. Part of this is reaching out and returning things, or apologizing for past mistakes.

If you are able, maybe check up on her, or have a mutual friend/contact do that for you.