No she didn't ask for the source.
I had photocopies with me.
Could she see the files from last year with certificate from consulate?
Don't think so.
But when asking about the procedure last year a male officer said that I might be asked for some proof of income.
Game of luck.
As I send on my own and have some savings back "home" the amounts differed more than usual (66k to almost 90k in April/May).
Sometimes less, sometimes more than the pensions make up.
No questions asked.