i will not choose this, actually i will not consider those whom i cannot contact their ex-employer.
you may contact more agents to choose. I have been looking for maids recently and i have contacted 3 agents, and interviewed around 8 maids before i found this one. Althought i don't know if she's good or not (not yet report duty) but at least i can contact her ex-employer & she has experience in taking care babies which gives me a bit confidence.