How do I work that out to feed my 2 year old?

My 4 year old will be eating lunch at school at 12:45pm. I am trying to think of the logistics of getting LO2 her lunch, would I just feed her before we bring LO1 to school and just not have my preschooler eat with her/us? We won't get back home until 1ish and that's too late for me to make lunch, have LO2 eat and get her down for a nap.