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I hope she legally can and has the maturity. An 18 year old gal traveling alone is a sitting duck. I don't share this with too many but here goes: at 20 years old, a bad guy forced his way into my vehicle, kidnapped me, raped me and strangled me and I lived to tell about it. I am one of the lucky ones. He was never caught. I wish I had someone to give me the tools to protect myself when I was of a most vunerable age.
Also, carrying a gun is NOT a talisman against bad things happening. Regardless of age...if she is going to carry, she needs to get training. Responsible at 18--I'll buy it. But it doesn't mean she's been prepared to take a life. It doesn't mean carry a gun and then pull it out to scare someone off. She really needs professional training...(i.e. not you). It's not that you're not capable of training her, it's just not a good idea. Seek out professional training...and know the laws of your state for carrying at age 18 AND the laws for use of deadly force.