First off, it sounds like you are very generous. I think it is very nice that you offered to set her up if she is willing to quit smoking.
However, if you disagree with part time vaping/part time smoking, then don't feel the need to give or sell her something you may still want. Like you said, help her find a good setup online. Help her find the right juice, let her pay for it.
I don't know anyone that vapes, so I started down this road in total confusion. I looked online, but nothing made sense. I decided that if I was going to start vaping, I was quitting smoking completely. I couldn't continue smoking as I was. But I didn't want to quit AGAIN, because I just kept starting to smoke again. Even after quitting for 3 years. I hadn't found this site or really any forums yet. So, I went to our local vape shop. Yes, it cost a whole lot more, but their advice was invaluable. I told them that I wanted to quit, but vaping was a complete mystery to me. They asked how much I smoked and what brand. They showed me several different beginner packages. I went with an eGo style and an aspire tank. They recommend a juice that was most like what I was smoking, and I bought a tropical fruit and a cereal flavor, as well as some coils. The price added up! But it was about the same as a,week of smoking. I think having to pay for these items makes you give it more effort. I think if someone would have given me all of that, I wouldn't have any idea how much money they saved me.
I decided that I was going to quit smoking the next day. I thought it would be hard. I went home and had a cigarette, then I took my first puff of vape ever. And I could not believe how much more I liked it! It tasted better, cleaner. I did screw up once. My tank broke 2 weeks in. I smoked 3 cigarettes. And I have not wanted one since! They were awful! So it is ok to slip up. I think it's ok to vape 1/2 the day. But not if you are making your addiction worse. Nor if someone gives you everything for free.