I just quickly checked her insta and I found 3 photos with CP in them for flash promo. So I don't think it's right when you wrote she constantly leaves out CP while promoting the show on her own insta.
I just quickly looked. There are probably more.
CP posted the Flash school photo from 2018 SDCC and the last time she posted a photo of DP was in July 22, 2017 SDCC cast photo of all of them.