My autistic friend is being taken advantage of my her “friend” and doesn’t see it. So how do I help her realize it?

Okay so I have a friend (let’s call her Dayla) that is autistic but sweet, kind, nice, has NO mean bone in her body and she’s smart. Dayla puts her heart out to help people and please others. She’s smart but naive when it comes to people and relationships. So she’s been hanging with this girl right (let’s call her Heidi)? She’s known Heidi for two years. They seem to click right away but for the last couple of months that her I quote “friend” has been taking advantage of her. Dayla complained about how Heidi had been being treated and what I’ve seen.
Examples:

She give rides when she needs something or goes out.

She cries to her that she has no friends and Dayla is her only friend she has left.

Every month they hang out and asks Dayla to bring money so they can go out shopping, go out clubbing or meet guys. Heidi lies about working while she is lazy and does NOTHING.

Heidi uses Dayla for her money, rides and treats her horribly. I’ve seen it and so on. I tried to warn Dayla about how Heidi is treating her and using her. I’ve seen how she treats her, looks at her (she’s jealous of her). Dayla yells that she isn’t taking advantage of her and the poor girl is lonely, has no friends but I told her she is but she’s too blind to see the truth and very naive about people. Dayla got angry at me, said she’s not naive and hung up. I’m so frustrated with her and I can’t bare to see her get used so much. Dayla won’t get rid of her. I’m tired of her complaining and not doing a damn thing about it! What do I do? I was telling her the truth. Even her best friends tried to warn her.

My autistic friend is being taken advantage of my her “friend” and doesn’t see it. So how do I help her realize it?
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