I agree with both POI's but I am more on Aushutosh's side one this.
Off course kids need to be handled with fun and care like Niddhi did until the point where she agreed to Shenshah's terms of playing catch.
She should have analyzed his conditions before blindly agreeing to his terms of playing around in an hospital.
Coming to professionalism, yes she should have been a little more professional because at the end we did see signs of attachment in the end when she was talking about the kid in front of Ashutosh because at the time when he might need surgery or be in a critical conditions her hands will shake trying to help him. So for HIS betterment its better to be a little professional.
But I did like the way she brought some fun, when she talked to that girl in one of the episodes before etc...