You are in Indy and if she is too, it rains often there. Well at least some of the time. How about adding a place on the outside that would hold an umbrella, in case she is caught in a storm and perhaps a pocket for a water bottle. That is how I am making mine. You could use a tab with a snap or elastic to keep it snug at the top.

I made this tote a few years ago out of light weight upholstery fabric and a nylon faux suede. I used a light weight iron on fusible. I called it my "Carpetbag!" I used it as a carryon for a trip to London and Paris. I could put all kinds of things in it: all traveling papers, place for water bottles, books, food, extra clothing, valuables and it still fit under the seat. You would be surprised at the space. BTW. I left my purse at home on purpose.... It is a little time consuming but nothing the average sewer couldn't handle.. just label things as u cut them... Funny thing, my daughter just asked me to make her a new tote bag as she is a Wilton Cake decorator instructor. This bag immediately came to mind but I couldn't remember the name of it. so Thanks! for re-freshing my memory!

What colors does she like? I would make something strong & durable of a dark color combo.