to which she simply indicates
 

-Her colleagues find it amazing that she works so hard for no money, to which she simply indicates that she loves basketball and wants to pass on her enthuiasm to younger players.

Do you think it's wrong and it should be 'in answer/response to which, she indicated that...'?

Re: to which she simply indicates
 

No it's fine. I don't like indicates though - I'd replace it with answers unless the context justifies it :

Her colleagues find it amazing that she works so hard for no money, to which she simply answers that she loves basketball and wants to pass on her enthusiasm to younger players.

The use of the present simple is a bit odd here - but as I've said before, without knowing the extended context, it's impossible to evaluate language use accurately. It would make more sense with eg always : Her colleagues always find it... etc

Re: to which she simply indicates
 

Good answer. Thank you.