The Playboy Playmate formerly accused of taking money from innocent children just won big in court -- because the lawsuit which claimed stole another woman's child support was just dropped.

Ida Ljungqvist's lawyer, Keith Fink, claimed the other woman decided against pursuing her lawsuit because she was told she faced a malicious prosecution action if she followed through with it.

Katrina Kantner filed the lawsuit on May 28 -- claiming Ida received $90,000 from her ex-husband, Doug ... all while Doug neglected his $10,000 monthly child support payments.

Ida's lawyer claims she was targeted simply because she is a celebrity.