Sources close to Anderson tell TMZ ... she believes Charlie was acting so crazy in his hotel room at The Plaza Hotel on Tuesday morning -- that she felt her life was in danger ... and she also felt like she was being held in the room against her will.
As we previously reported, Charlie tore the room apart -- busting a chair and causing damage to several hotel items. Capri ended up locking herself in the bathroom and calling hotel security.
Capri claims Charlie also threatened her in the hotel room, although she made no mention of this to NYC cops when they interviewed her about the incident.
FYI -- law enforcement sources tell us officials have no plans to file charges against Charlie.