It sounds like Yinrun hasn't actually seen the tweets but only has Trish's explanation which is obviously going be spun in a way that makes her look as good as possible.
Trish's present behaviour (the stuff she's reposting on instsgram) makes her look very desperate, arrogant and entitled imo. I initially thought her apology seemed sincere but I actually think she just said what she thought she needed to say to make the situation disappear so that it didn't affect her 15 minutes of fame.
I think it's easy as a viewer though to think that people shouldn't be friends with her, but we don't have the emotional attachment that the HMs do. Regardless of what we now know, she supported people on the show and I imagine that causes a bit of internal conflict for them.
Yinrun is a nice person and I just hope her friendship with Trish doesn't lead to backlash for her. I'd be very interested to hear Jordan's take on it all.