Today is one of my friend's birthday and a lot of my friends (including me) wished her in a messaging app. She just replied us in a single word "Thanks" (just like that).
I want to tell her,
"Spend some words if someone wishes you"
In the above example, the phrase
"spend some words" is idiomatic or not?
If that is idiomatic, then is it appropriate to use that phrase in the mentioned context?
And, If my example is not good enough, then is there any better way to say that?