To me, this says the sensible thing to do is to get help in working on it. Helping her learn to manage this now will be a great asset for the future; little kids have little worries, bigger kids have bigger worries, and since she seems constitutionally prone to anxiety, giving her tools to cope with it early on is a gift.
Although I remember starting with the big worries early in life, namely nuclear annihilation and the sun consuming the earth, destroying all life, at about 6 years of age.
Granted, I did move onto the heat death of the universe and existential hopelessness in high school.
In hindsight, I probably could have used some coping skills.
