There was a referendum last year (or possibly the year before - memory escapes me) with a majority against secession. They cannot claim there was a majority for independence as the coalition itself had no manifesto, but is a post election grouping of different parties.
If they were elected on a "declare independence" platform they would not need another referendum. They do not need a head on clash with Madrid to forward the wishes of the Catalonian people.
I very much doubt there is, and would strongly advise against, anyone following this message board to decide anything about anything!