The impression I get from Naga is that she is more self critical and wants to be the best at what she does, but gets frustrated with herself when something isn't coming together.
I'm sure most (if not the majority) of us on DS are exactly the same?
Yes, she might've had a few bad tempered words with Pasha (NB; I find Pasha's name being autocorrected to Pasta brilliant!!!

) but maybe she was struggling with the routine all week. Maybe Pasha behind closed doors is more demanding as a dance partner and almost expcts his partners to pick things up super quick.
It's too predictable to assume Naga is the bad tempered one in all this just because she's the "celebrity". It wouldn't surprise me if Pasha only adds to Naga's own frustration. I reckon Naga actually wants to do better and is still finding her feet (so to speak) whereas Pasha is just impatient.