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If your hip flexors are tight, then encouraging an anterior pelvic tilt by lifting a knee is only going to compound the problem. Trying to reverse the pelvic tilt by engaging the abs without releasing the hip flexors won't help, either; it'll just throw your quads, hammies and calves completely out of balance.
Well, we don't actually know if her hip flexors are tight. Most people can use the stretch, though. And, if you gotta get the dishes done, you gotta get the dishes done, and if putting your foot up helps, no harm in it.