A few months ago - maybe after she had visited the studio? I don't listen to Sirius, so I don't know, but from what Corkie says, Susan certainly does belong there. I can accept why she's not played on regular stations, but this one I really don't understand.
But without having heard this station, I'm betting that even for those standard artists, they play the same songs over and over. It's something that frustrates me, that radio stations never break out of the groove and go with more variety. For instance, Streisand - you'd think she never recorded anything but "Evergreen!" Maybe it's the same "groove" mentality that keeps them from playing Susan.
On Pandora, you can create a Susan Boyle channel. I haven't gone there in a long time, but they have a couple of her songs available and then play songs in her genre, Streisand and Josh Groban are ones I remember.
"There will always be plenty of people who will give up on you. No need to give up on yourself" Susan Boyle