She sounds like a strong women, and has been preparing you for this. These things happen to all of us eventually. You should be strong for her sake.
No offence intended but, Scared and worried for who? Yourself or your Mother? Seems to me she is trying to comfort you, and will continue to do so for the rest of your life. She will always be part of you. I can't hardly tie my shoe without thing of my Dad, rest his soul.
You will be fine, "Truth heals, it just takes time..."
Prayers and thoughts