Unless she is family there is no visa for you to sponsor her.
She has to have enough money to be able to support herself to come here.
As a temporary resident you would not have the capacity to sponsor her as you are only able to work for 20 hours.
You can provide documents to say she is staying with you rent free and then she is not required to pay accomodation costs.
But she has to be able to support herself while here.
But to be able to sponsor her she has to be family.
I hope this makes sense and is of assistance if there is nothing further
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