Most musicians don't, they are owned by the big production companies. If Trump has received (or purchased) the right to use her songs from the production company (which would be quit easy for him or his companies to do), nothing she say actually matters legal wise.
That's what I thought. You can't publicly market your music and then censor who uses it. Is Adele going to say that Trump cannot listen to it personally?
She needs to just shut up and enjoy spending the royalties.