>>112467630Helen would have had to wrap herself around the Omnidroid in hopes that it would damage itself enough to leave the core exposed, but the chances of figuring that exploit out are extremely slim. Bob got as close as he did was because of a bad back issue that startled the Omnidroid long enough to take advantage of the situation.
It would have to be absolute sheer luck, just like how Bob got lucky. The Omnidroid was basically at peak efficiency as a killing machine at that point.