1stly... how would you know who the secret admirer is since it's
"Secret" hur?
I think what you are trying to say is that the guy likes this ger
but he din tell her.. so he's the secret admirer rite?
Cuz the misuse of the word "secret admirer" makes things so
confusing..
Ok.. back 2 your qs >> Perharps he could buy her
flowers?
Girls (at least majority) wun mind receiving flowers , cuz it's
kinda sweet... 
Tho' flowers aint practical but it's bound to bring a smile onto
her face..
However, if the ger is a practical & down-to-earth person, rule
out that idea!