Exactly, she is a baby in terms of experience compared to this slimy douchebag she's going out with and she's going to need the guidance of her parents to tell her if and when this douche is playing her.
When I went out with an older man, I told my parents and of course they were disappointed, but I'm glad I did because they were the oneS who opened my eyes that the guy wasn't good for me in the long term. That experience didn't change how they viewed me. They still trusted in my choices in life but they were always there to guide me when they thought I was heading through the wrong direction.
Tell your parents woman. As their daughter, you owe it to them to let them know what is going on with your life. No matter what, they will always worry about your well being. That's what parents are for but no matter what also, they will always stick up to you and love you!
And don't listen to those pricks who tell you that just because you are 24, you're not obligated to disclose to your parents anything. That maybe true when you follow the bullshit law created by cluster fukc politicians, but in your eyes, I'm sure you know what is the right thing to do.
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And who said she has to go into details about her sexual escapades?