Student or Learner
I wondering if the structure of this sentence is correct.
She will try to throw you off if you ask her.
I try to say that "she will confuse you if you ask her"
I see no reason to think that the OP meant "refuse".
"To throw someone off [the scent]" means to divert them away from the matter at hand or, to a certain extent, to confuse them.
I was researching the planets in our solar system but repeated mentions of Pluto being or not being a planet really threw me off!
Roger Waldemar, yes, the structure of your sentence is correct. I can't really see the logic of it. I don't know why anyone would ask someone else to purposely confuse them but, if that's what you want to say, your sentence is grammatically correct.
MatthewWai, we have asked you repeatedly not to leap into a thread before a couple of native speakers or teachers have responded. This thread, again, shows that you did not understand the original post correctly and have just confused the issue by suggesting that the OP did not use "throw me off" correctly or that they got the definition wrong.
Remember - if you don't use correct capitalisation, punctuation and spacing, anything you write will be incorrect.