She either had entrusted herself to Christ alone, for eternal life before her death and she was already a saint, or will never be.
Francis doesn't know and can't declare her one.
They believe she’s a saint because of what she did. I’m know I’m a saint because of what HE did.
"Francis doesn't know and can't declare her one"
Speaking in terms of unaided human knowledge, you are perfectly and exactly correct.
None of us would have any way to know for sure, were it not for God providing a sign from heaven. #43 --- check thou it out.
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Canonizing a person and giving him/her a Feast Day on the Church's calendar invites us to remember the witness to Christ that that individual was on Earth. It calls us to look into how they loved and sacrificed for Him and how we can learn and be edified. That is the reason it is done.