picking up some shit from outside your house isn't strike breaking any more than walking to work when there's a bus strike on is. Had she been collecting commercial waste - the stuff council's actually make money on - then that would have been different. If you've got dirty nappies and needles outside your home, you'd be a feckin idiot not to pick them up.
She (and the other collectors) should have gone and dumped their collections on the town hall doorstep, but, even without that, it isnt scabbing. As, iirr, the local GMB agreed.