Sister asking for money

Kinda long sorry but I need advice :/

My older sister has been asking my husband and I for money a lot lately and I don't know what to do. She still lives with my parents, she doesn't pay them anything to live with them, all she pays for every month is her car and car insurance along with her phone bill and she's making close to $2,000 a month so there's no reason for her to not have money. A couple months ago, she called me saying her bank account was -$1,500 and she needed to borrow money to get her account back to $0, she wouldn't tell us why but we said no because we didn't have the money to give her. 2 weeks later, she called asking for $400 and said it was because her and my parents were splitting the rent deposit on my parents new house and she lied to my mom saying she had the money but she actually didn't, she told us she would have the money back to us at the end of the week and my husband decided to trust her because it was helping my parents out too so we gave it to her, it took her over 3 weeks to pay us back and she was really rude about paying it back too. A few days ago, she messaged me asking if I knew a way to get more money because her phone bill got cut off from not paying it and then today she messaged me asking for $200 and said her boyfriend messed up her account and now she needs $200 which I don't understand at all. We always say no because we don't have the money plus we have a baby coming in about 2 weeks so we can't just be giving people money. I haven't told my mom what's going on because I don't want to start a family argument but I honestly don't know what to do anymore. I talked to my cousin about it and she told me my sister has been asking HER for money too. Should I tell my parents??