@Emily47, I checked your listing but didn't find that review. The two that were there were very positive. Did the guest make those comments in a private message to you? If so, I wouldn't worry about it at all.
If you respond, be objective. Maybe say something like you regret that she felt you hadn't been 'present' or paying attention, when in fact you'd enjoyed the brief exchanges, but you had other commitments you'd needed to tend to (work, charity, etc.) at the time, and hadn't realised she had expected to spend more time with you. And you hope she enjoyed her stay in your accommodation.
Another possibility is that precisely because of your varied commitments, you might have appeared restless or distracted during those exchanges. If that's what happened, it might be a good opening for you to step back and examine priorities and - as I believe is said in Zen teachings - 'When you're drinking tea, drink tea'. 🙂 Meaning focus only on what you're doing at any given moment. Just a thought. I'm being in no way judgemental here. 🙂
Anyway, strange for sure, but there's nothing stranger than folk. And who knows what goes on in the human heart, eh? 🙂