Rack recommendation for a small bike

My wife recently got a Cannondale Quick 5, size small. The bike has disc brakes, and the seatstays have a dogleg that elevates the lower rack mounts above the rear disc. Because the bike is small, the seatstays forward of those rack mounts are practically horizontal.

I'm looking for a rack to mount on this that has a relatively low height. Something that I can hook conventional panniers to (Ortliebs in this case).