Your work, child, and routine works for you. So no problem.
Sure she may be irritating...but since you obviously are very articulate, just "share" with her in a diplomatic way, that you are happy with your life. You don't have to go into a soliloquy about "why" and how hard you planned this for your life.
Some people are just "meaning well" but don't know they are irritating. At least she is not a "toxic" person, as it seems. She is just nagging you.
If anything... explain that at your stage in life, you are VERY happy with how things are. YOU want to appreciate, enjoy, live and love your children and every minute of it while you can... and since you can afford to in more ways than one... that you feel very satisfied. And you ARE doing EXACTLY what you want to do. Then add "but thank you for your concern... I would not consider daycare because me and my children are exactly where I want us to be, and are very happy...."
If this is the only irritating thing about your new friend... and if you can say something to her and be reciprocated in kind by your "explaining" you decision to her... then great... she can handle it and YOUR life. If not...maybe she just needs to learn as well, how to back off a little. Some people just "have to" take care of everybody... and try to change them, for better or worse.
Or, just explain that "everybody is different..." Much like how we Parents use this phrase to teach children about diversity and acceptance of other people.
Just have a heart to heart talk with her maybe. Either she can understand or can't. If she keeps trying to "change" you... well, then that would be more than irritating... and you have to manage that with her, or not, if you decide to.
All the best,
Susan