OP if she lacks maternal instincts, she might also lack good long-term relationship qualities as well. Just a possibility to think about.
Also, if you want kids, and you should, then you need to find real wife material.
The world needs more intelligent, level-headed people like you, OP. People like you built the USA, and people like you are needed to preserve it. We will literally turn into a dumpster fire if intelligent, reasonable people stop having kids. There is no other possibility.
Don't even worry about kids being expensive. They don't NEED 100-200k for college. You can help educate them yourself, and teach them how to run your investments when you get old.
This woman doesn't want to think 5 minutes ahead, and she wants to spend the rest of her life with this mentality.