16 mo old waking up crying

my 16 month old does sleep through the night this morning she started crying around 6 a.m. but then settled back and went to sleep and then woke up around 7 crying once I got to her she was inconsolable and even when I brought her out into the living room to drink her bottle she didn't want her bottle she didn't want toy she's just cried after I finally did get her to drink the bottle she was fine and she's walking around fine but seems a little off is this normal she was almost crying like she was in pain but she seems fine now do you think maybe at 16 months she could have had a bad dream? Or do you think it could be something else? this is not normal for her