There's no point releasing Wish You Were Here if she won't have any promo. It'll probably do even worse than Smile, just because of how bad that one did. She needs massive promo spots, and I don't think RCA is prepared to do that for her.
Wish You Were Here needs to be feautured in a movie, tv comercials, and she needs to perform it on Ellen, Oprah, and VMAS, maybe other shows. Otherwise don't bother.
She'll be touring in Europe and in US later this year. So WYWH may be a single to promo her tour