In every case I can think of, the two-word phrase is a synonym of very (substitute extremely, exceedingly, exceptionally, especially, tremendously, immensely, really, truly, to a great extent/degree, etc.).
It's ever so frustrating! = It's very frustrating! or It's truly frustrating!
She's ever so hungry! = She's extremely hungry! or She's really hungry!
The phrase isn't used to indicate continuing or increasing emotion.
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