Well, this is more interesting than talking about boots or back packs. Keeping in mind that the original question was not meant to be taken totally seriously. ie, the guns and flame throwers part. I would not worry at all traveling as a single female. You will only walk alone if this is what you want. You will meet other walkers you will walk with for a few hours, days or possibly your whole Camino. If you want a more solitary experience, then just walk within a reasonable distance of a group that is more or less on your pace.
Without being paranoid, you need to keep a low level situational awareness as to what is going on around you. Check your '6' every now and then.
The only time of year you would need to be worried about being truly solitary is on a late fall, winter or very early spring Camino, the rest of the year there will be a lot of walkers, certainly in September as you plan.
Also, being that a Camino is a pilgrimage, you need to have a certain amount of trust in your fellow man and that the man upstairs are looking out for you.
Also, get your husband to go. I was dragging my feet on the whole Camino thing, sure glad I went, now going back for the forth time this year to do the Portuguese route.