Gf said she is not worthy of my love :(?

It sounds like all this turmoil in her family has made her reluctant to make a commitment right now. Since you're the guy in her life right now, she's backing away from this relationship because she's afraid. If her mother has been left in a financially difficult situation, your girlfriend may be working hard herself so that she never finds herself in a similar situation. But she's made it clear that she's not interested in taking this relationship with you any further at this time. Unfortunately, you need to respect that, even if it's not what you wish. You do need to email her to confirm that she's ending your engagement and to wish her and her family well.