I've never heard of an actor asking for, or getting, a "right of
first refusal". I'd be confused, too.
A first refusal clause is usually something a studio asks for from
a prodCo they want to be in business with. The studio tells the
prodCo to offer any projects they are developing to them first.
They get the first look at it - if they want it they go forward, if
they don't they turn it down so the project can be shopped to
another studio.
She is saying she has the right to refuse what? If she has been
offered a part she doesn't need a contract to say, "No thank you".
I can't imagine she is asking for the right to be offered a job on
you next project. But maybe she is. If so that's highly unusual.
And a really bad deal for a producer.