Blacksmithing is one of the few hobbies that a guy probably can’t teach his girlfriend because women usually use a different technique to make up for strength differences.
Me, a woman who tried blacksmithing before: Don’t use spring steel or other metals that are hard to manipulate/hammer into shape when starting off. Don’t start with a sword, start with bending and twisting a nail into… whatever. If they like the hobby they’ll stick to it and the muscle will build over time. And if it doesn’t: power tools.
That’s true. I was in luck and there was a blacksmith in town who opens his workshop to kids on occasion or travels to job conventions and brought his tools with him. Maybe there are comparable activities/ offers near you, which I can highly recommend. Not only will you not have to worry about tools and materials, most importantly there will be a “teacher” around.
If you find something and decide to check it out, have fun! :)