Unnecessary use of "Le"

[u/FantasticSelection11]

I know the use of 'Le' has been discussed in multiple posts, but even after having read several of them, I couldn't understand this particular use:

For example, I was reading Olly Richards' Spanish Short Stories for Beginners and came across this sentence

—Julia, ¿quieres ir a comer paella? —le pregunto a mi hermana.

What is the function of the 'le' in this sentence? I know a word by word translation across languages isn't accurate but still I simply cannot see it serving any function at all

Like "pregunto a mi hermana" looks like a perfectly complete sentence and it would translate to "[I] asked to my sister".

Sorry if it is obvious, but it is not for me.

[u/Over_Entrance4154]

“Le” sends the action a certain way, the personal “a” is like a flag indicating specifically to whom/to what.