I've come across the following paragraph in the coursebook called "Prepare" level4 (CEFR level B1) by Helen Chilton CUP (2015):
Jess is a great friend. She's always smiling and she's never miserable. She really makes me laugh.
According to Michael Swan in his "Practical English Usage' third edition 'always' with progressive is 'used to talk about things which happen very often (perhaps more often than expected), and which are unexpected or unplanned".
According to E.A. Istomina and A.S. Saakyan in their "English Grammar" the present progressive is used to express "actions generally characterising the person denoted by the subject, bringing out the person's typical traits. Such sentences are emotionally coloured, expressing irritation, disapproval, praise, etc. In such sentences the adverbials 'always' or 'constantly' are obligatory: You're always showing off'. She's constantly complaining that she has so much to do.'
I cannot grasp what is so unexpected about the girl being cheerful. I cannot see anything in the context which would make me infer that it is an emotionally coloured sentence.The choice of the tense seems really unusual to me here.
Can anyone elaborate, please?