Magic comes out of her and forms a sphere of approximately the correct size. The four-dimensional weave of tiny nodes are spaced further apart than in his sphere, like a golf ball with too few dimples separated too widely. In his sphere, the oscillating nodes have phases that change in equal amounts across each gap between nodes, and in her sphere the phase differences are less exactly identical. As a result her own sphere is leaking power, or rather, is leaking much power than his sphere; in her sphere maybe a percent of its energy every few seconds is radiating off through other dimensions to nowhere, while his sphere would take maybe an hour to lose half its energy. (Orphan's memories make this feel intuitive if maybe not completely analyzed; sure, if these oscillations had irregular phase-steps, some power would leak.) His sphere is tethered to him by a bare strand of added energy going into a few surface nodes, to make up for his tiny leakage; for Opalyn to maintain her sphere is drawing a correspondingly greater amount of power out of herself (a practiced sort of mental motion to Orphan, though, to whom the thought of being 'more efficient' does not seem to have really occurred at any point).
Her first try at the faintest possible sphere... has come out about eight times as strong as Fdera's current falash sphere.
It does feel like she could weaken it further, now that it's been formed, or that she could make a new sphere that would be the correct intensity, now that she's calibrated on willing that to happen and not just hoping for it.