Just a thought, but regarding dragging her foot/feet when she isn’t on solid ground outside and possible loss of feeling, it might be worth having some blood tests done on Katie for tick-borne infections. If you’ve seen a tick crawling up her leg, it’s highly likely there will have been others that have attached themselves to her and dropped off again before you noticed - nymph ticks are the size of a poppy seed, and difficult to spot even when you’re looking for them. The symptoms you describe in Katie, including disrupted sleep patterns, are common in humans with tick-borne infections.
Lesley and over the bridge Omar,
11-2012, Sutherland, UK
Omar - Case History