If I quit my PhD, would it make my advisor look bad? I am considering quitting my PhD in computer science, because after doing a software engineering internship I realized I enjoy that kind of work much more.

My advisor has been very kind to me, on both a professional and a personal level, and if I quit it might make her look bad. She is an assistant professor and I was her first student. I do not want people to think she was the one who made me quit.

Are people going to wonder if she was the reason I quit?

How much of an effect would this have on her career?
You are a nice guy, but let me tell you this: no matter if it makes your advisor look bad, if you really like the job in the company and believe it's the best thing for you, then you should quit your PhD and take the job. Doing your PhD just because of your advisor will not do any good to either you or your advisor.

Because pursuing a PhD requires a lot of determination. No matter how your advisor is kind to you, making your advisor look good will not be enough as a sole motivation for your PhD. If you don't quit now, you will quit later and it may cause more damage to your advisor.

For a complete stranger like me, if a guy quits his PhD after 1st or 2nd year, there are many reasons beside a bad advisor: maybe the guy himself finds PhD too difficult, or he changes his mind etc and etc. But if someone quits his PhD after 5th or 6th year, I would think there must be something wrong with the supervision.