K has been doing something similar the last few nights. We tend to first try the quick settle, atm its not working so we get her up, take her to our room, let her play on our bed quietly with lots of cuddles for 10-20mins, give her a drink of water or a BF if shes still beside herself, then we go through our whole nigh nighs routine again. (And we do check her nappy too but most times theres nothing there or only slightly wet)
Babies can go through seperation anxiety quite a few times, its not a one off thing, esp if something has changed. Atm Ks daddy is doing extra time at work, and he does evenings so I think this is her way of getting interaction with him and both of us together.
On another note, is it possible for you to let her snooze cuddled with you until she is basically asleep then transfer her back to her cot? I know this doesn't work with quite a few babies so take this one with a big grain of salt