Key time for separation anxiety. And if she's dropping a nap then she's bound to be a bit all over the place.
We converted dd's bed at 14months btw.
I'd be tempted to try and calm her down and to lie with her and then try a gradual withdrawal.
You might also find that she is developing big skills which interrupt sleep enormously (might be why she's dropping a nap too). She's the right age for really working on her speech and understanding of the world and probably finds it hard to switch off.
It's your choice but if leaving her is not working and she's upset then why not try another way. It'll pass, it really will.
The other thing is she might be a bit under the weather.