Okay, at 5 foot 7 inches, you are at the limits of minimum height for most 26inch fatwheel bikes. So you will want something with more classical sized tires if you want 26 inch wheels. The eBikes with the 20 inch wheels will be easier to mount, especially if it is a step-through design.
Your short distance means that virtually any bike will be able to cover that distance. You will find any bike with an 11 to 15 Amp Hour capacity more than enough to do the round trip assuming it is a 48 Volt battery. Hard surfaces means you won't need a fancy dual suspension.
Medium hills probably indicates a less expensive hub-motor will work for you as well.
I do suggest getting a bike which comes with a rack, as most sellers gouge you on buying them as an "add on" part (for a fee). The same with fenders. Get long fenders, not short demi-fenders. Those shorter fenders are largely for show.
I find having a written "wish list" when I am looking online at bikes allows me to rapidly discard choices which do not match ALL the desired features. Your most limiting selection will be cost.
I got a bike for my wife which checks all your boxes. It came with headlight, tail light, brake light, rear rack, 750W motor, 15 Ah battery, front suspension, Good torque for climbing, full fenders, but it set us back about 900 dollars. It is a folder, as a smaller storage space was important to her (at the time of purchase). She uses that feature less with time. It was an "ACTbest Knight".
I am sure there are others here with direct experience purchasing bikes in the 500 dollar range, and I sure hope they chime in on what they found. Lacking that, now that you have parameters, finding an ideal bike should be fairly easy. Once I narrowed down what my spouse wanted, it took only a few hours to zero in on a specific choice for her. She has since added a rear basket, and loves it. I am more of a saddlebag kind of guy (I like my stuff out of sight).
Picture of our bikes:
