They sometimes dig several test holes. . .maybe to fool a predator?. . .maybe just looking for the ideal spot, but quite often the 'real' nest is right around the mouth of the burrow. Since she came from a household with males and females chances are good the eggs are fertile.
My husband died in '83, and several years before he died he went on a motorcycle trip that had him coming home through the Mojave desert. He stopped at a roadside stand and bought me either a packet of saguaro seeds or a tiny 1" potted saguaro, I can't remember which. At any rate, for the past...