Managing my mind around work/being a mom

I’m trying to figure out how to manage my mind and my life around working full time, creating an online business and spending quality time with my kids. I’m finding that either I’m not managing my time, my mind or my priorities in a way that serves me. I’m working all day on my work (job), trying to find time to work on my online business and then the rest is for my kids. My daughter, age 3, told me that she misses me and wants to spend time with me. I’m struggling with the thoughts that maybe I’m putting my online business or work in front of being with my daughter. The goal is to build an online business that allows me to be more present with my children but while I’m building it am I creating just the opposite – with little time for my children? How can I work this out in my mind?