My mother quit her PhD program back in the 50's, because she wanted to have children and didn't feel that she could put the time into both. This was a disappointment to a number of people, because, in those less enlightened days, they wanted to make her an example of the ability of women to get a doctorate. She decided that the issue of women's equality wasn't as important to her as starting her family. My father said it was her decision and he would support her either way. A number of years later, she became an English professor anyway, spent 40 years at it, and raised seven children along the way.
To quote the old saw: be who you are, because those who matter don't mind and those who mind don't matter. The trick is finding out who you are.
One more thing. If this lady is good at what she does, you can't do anything to hurt her career. If she isn't, nothing that you can do will make her career. So, your decision isn't particularly important to her career one way or the other.
EDIT: Looking at other answers and reading comments, it's clear that there are considerations that I didn't think of. I guess in the end, we can all spend a great deal of time working out the effect that this will have on your professor, but the only person who really can tell you is the professor herself. You need to "fess up" and tell her you're thinking about quitting and why. Maybe she doesn't share your concerns, maybe she has concerns none of us have thought of. Maybe you can work something out that will benefit both of you. But you never will really know until you face her and tell her what's on your mind.
By the way, I have 30 years experience in the IT field. PhD's in computer science generally make better money than software engineers, and often find interesting work. If, for example, you want to write software programs to calibrate scientific equipment, that PhD will help. If you want to design websites or databases for health care companies, it probably won't.