alli seems to be doing just fine, but then, seemingly out of the blue, she has

an attack of anxiety. she is probably suffering from:

Panic Disorder

Explanation:

Panic disorder is the type in which the patient suffers from severe fear ad anxiety. at time if the anxiety is out of control, they get a panic attack.

These sudden anxiety attacks are triggered though events or objects that might have a negative effect on the patient.

I hope the answer is helpful.

Thanks for asking.