Language Development. Matter of concern?

A. We have met a baby of 2.3 year old for adoption. On Meeting the child did not utter a single word though she was with us for 2-3 hours. (she met us in presence of her caregiver and social worker etc). In her Medical report she is referred as normal child and in language section : in reply to "can speak word" answer Yes written while in reply to "can speak sentences" answer No written. Is it a matter of concern? B. We were of d view that a two year old cant speak sentences, but her silence was strange. HOW TO UNDERSTAND A TWO YEAR OLD NOT MUTE in such a short period. Is d remark "cant speak sentences" is pointer towards some serious problem C. FYI : otherwise the child was responsive, she was following instructions, even responded while we talked to her by shaking her head. A little guidance will help us to a large extent Thanks