Anyone who knows me knows that I am extremely pro-helper, but we all know this happens a lot. Come on, who of you haven't seen helpers sitting dogs while they scroll through Facebook?
Weirdly, I had the same problem with our last helper and ultimately terminated her for it... not for not walking the dog, but repeatedly lying about it.
Tough call, I wouldn't judge you whatever you did... I'm tempted to suggest talking to her or whatever, but the reality is, I've seen it plenty of times and done nothing... part 'mind your biz' part 'what if she gets fired and her kids can't eat'... HK does weird shit to morals.