No, there's absolutely nothing you can do, that's if you don't want to cause an argument between her parents and yourself! Until they waken up to the fact their daughter is a spoiled little brat and take steps to modify her behaviour, then you are on a hiding to nothing! ?
If you find her behaviour upsetting, then I would suggest that you distance yourself from her and her parents! Of course, it's not going to be easy, but for your own peace of mind, it may be the most sensible option! I have a daughter who has always been difficult and her partner is an over-entitled spoiled brat who, in my opinion, needs a good boot up the backside! They have just had their first child on 12th January, and although it breaks my heart that I don't have a better relationship with my daughter, and that I won't be involved in my little granddaughter's life, I am not prepared to be treated like dirt by my daughter and her partner, so I will stay away and let them get on with their lives! Fortunately, they live over 50 miles away from where I stay, so it shouldn't be too hard! Maybe one day, as their little girl grows up, they may see the error of their ways, but I am not going to spend my days waiting! And after what they have both said and done to me, which adversely affected my mental health, I am not really in the mood to be forgiving! ?