My 27 month old crys when I drop her off at daycare but is playing fine once I come to pick her up...she been at the same daycare for a year?

Separation anxiety. Separation anxiety is very common in this age group. Ask your day care worker how long after you leave, that the crying stops. It shouldn't be very long. If you are concerned about her care there; make sure you drop in, occasionally, unannounced, to make sure things are ok. I still remember how it broke my heart, when my kids did that! It gets better!