I believe this is a female, Hawaiian garden spider.
Yes, she’s Argiope appensa. It can be difficult to recognize a spider’s gender from this angle, but in this case she has the look of an Orbweaver that has finished ovipositing her eggs into silk sacs. Their stretched out abdomens look wrinkled and the posterior bends downward. They often also go to the ground to hunt and find water. They’re probably weak after losing so much of their mass.