She has stated how she feels and what she wants. There isn't anything for you to do. She gets to decide how her relationships go and you can't make that happen. She is a separate person with separate thoughts, wishes, feelings, goals.

It is not possible to reboost her feelings toward you. She is fine where her feelings are. To attempt to do anything would be out of place and intrusive.

All there is for you to do is to be in touch with your own feelings of loss and grief. They will get better in time.