J.B.
I do think it could be that she was over tired. I know, finding that just right level of tiredness can be tough!! But usually when my son cries a lot he is either extremely tired or hungry. Both of those things can elicit some serious crying. She is at an age too where she can start to learn to comfort herself a bit. It may be a little trying because it is all new for her. I was nursing my son at this age so I would schedule a nursing session when I knew he was tired and he would go to sleep while nursing. If he was slightly awake I might rock him a little and then put him in his crib. If he cried I would give him some time to settle down. If it went too long, of course I would go get him and try to put him down a little later. If you aren't nursing her then maybe just a little rocking when she starts rubbing her little eyes or if you catch a yawn before any fussing starts. Best wishes to you!! You will get through this and she will be a champ napper before you know it :)