My Sister-Advice?

I have a little sister in elementary school, and I do love her dearly. 75% of the time she is cute, nice, and loving. The other 25 she just gets on my nerves. The bad thing about my little sister is that she's overly sensitive. And the fact that I often don't think before I say something doesn't help that. Earlier, I was mad about something she did so I told my mom "She's lazy and selfish and rude!" She heard me, was fine for a few minutes and then said "By the way Luvy (but she used my real name) I heard all those things you said about me. And I think the same thing about you. You're rude, selfish, and lazy. Nice Luvy." She then stomped off into the basement and locked the door. A few minutes later when I tried to come in she yelled "I want mom!" my mom finally went down and she started crying. A few minutes later I went down, told her I was sorry and that I don't mean the things I say and it's not something to get upset about. <br><br>She calmed down and went back to her normal self 5 minutes later. However we have been cleaning the house for my grandparent's arrival tomorrow and she saw her hurt feelings as an exuse to stop cleaning. She went over to play on the computer while my mom and I finished all the other cleaning. I picked up some stuff and dusted like I was asked, and came on here. My mom finally asked my little sister to vacuum upstairs, which she is finishing right now. <br><br>I realize I need to be more careful about what I say, I need to control my anger and not be rude to her, but I can't deal with her constatly pouting, ignoring me, crying, making me feel guilty. If I try to play a game with her and correct her about something, she refuses to continue and says how bossy I am. I know she looks up to me, I know what I say about her is important to her, but I need to find someway to help her be less sensitive. It's not just me either, when my parents tell her it's time for bed, tell her not to do something she blows up and thinks they're mean for yelling at her. I don't want to hurt her feelings but we all say things we don't mean and she'll never survive in the real world if she's constatly sensitive to what others say.<br><br>Advice welcome, rude comments not needed.