disrespectful friend


so i have this friend let’s call her <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">eve</a>. so <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">eve</a> is very disrespectful to her mom, she told her mother that her mother only married her father for money and told her that she doesn’t understand bc she’s always to drunk. idk what to do bc she expects me to back her up but i don’t feel that way. she also has trouble being serious, her parents will be yelling at her and she’s making jokes and laughing. when i asked why she makes it funny she said “i don’t like being serious” i feel like that’s not healthy but idk. pls help me, i want to help her but idk if it’s my business or not