References (Biggie!!)- more than one- like three. Years of experience, ages, gender, and any particular issues of kids she's watched. What sort of things did they while she was watching them, does she feed them meals/snacks on a schedule or when kid asks, how many kids does she watch at once. Does she keep them in her place or yours, if she's sick or has an appointment., does she have a fill-in or are you out-of-luck? Does she expect certain days/times off- if so when, You could also give hypothetical situations and asked what would she do if Beaner had a meltdoen or whatever. Just to name a few!!