Yeah, it’s going to be tough! It’s going to shake everything for her. Sterling too, but Sterling will be occupied not only the lies and massive changes, but dealing with a new mom. Of course it’s going to be a huge loss to her too, the people she thought were her parents weren’t, her twin isn’t even her sister (putting aside the technicalities of identical twins having kids) but mentally, she’ll be pulled in a bunch of different directions and will be busy dealing with that. For Blair, this is a net loss, all she has to dwell on are changes that are taking things away from her. A new aunt off in jail is hardly enough to make up for a lost other half.
A few days ago somebody asked off anon if I thought the parents treated Sterling differently because they were afraid she might stray like Dana, and I was like, nah, they treated her like any parents would the child they had higher expectations of. I was the one who was wrong, it turns out, since interviews with the showrunner reveal that the parents did overparent their adopted daughter, maybe not necessarily for that reason, it was mostly likely a combination of being more careful and trying to “make up” for…everything, but Blair will certainly now remember the difference in treatment and realize why and question it.