Am I a bad person???? (Kind of long)

Thanks for reading. So today we had a team meeting for my sisters kids. I currently have custody but DCFS wants to place them in Foster care since I have six kids of my own. So the meeting was about letting my sister, niece and nephew know the new plan about Foster care. My mom was there so my sister started yelling at my mom because my moms lease says she can't have any other tenants in her home so I told my sister that it's not my moms fault she can't have them and if she had her shit together we wouldn't be going through this. My sister started yelling at me and calling me a bitch and other things and the she got up and I thought she was going to hit me but she didn't and ended up leaving the meeting early. So now I just got a call from my mom that my sister has been in an accident and I don't feel bad I even said good that's what that bitch gets. I'm tired of her shit never taking responsibility for nothing she acts like a kid and is 14 yrs older than me. Am I a bad person for feeling this way?