I disagree. Poor comms can be forgiven if the SP clearly states on their page that they're part time and don't check messages daily. In that situation, at least the punter has been warned and knows a reply may be a while coming.
Although Chelsea appears to work part time and could so easily manage expectations, she doesn't. So, I'm not defending her, I'm just making a general point that if she (like some other girls do) put a note on her profile to say comms can be delayed - we'd know where we stand.