Make sure you get something that fits you.

Range is dramatically impacted by riding conditions. Rider weight (which you have covered at only 110lbs), wind, hills, speed and assist level can conspire to cut your distance in half or greater.

As long as you want to go at bicycle speeds (10-15mph) and do at least a decent portion of the work (say pedal assist 2), almost all e-bikes can hit 20 miles on a full charge.