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You can apply, but your chances of getting it remain very small. It's actually better if she applies for a TRV before getting married. After you get married her chances drop a lot.
That's interesting, well how is she eligible for that? Like you need an invite from family/relative right? Or anyone that holds an an PR card can send you an invite?
 
That's interesting, well how is she eligible for that? Like you need an invite from family/relative right? Or anyone that holds an an PR card can send you an invite?

Anyone can apply for a tourist visa. You don't need an invite.