Get your facts straight. April Glaspie never told Saddam he could invade Kuwait. She didn't say anything and he got the impression it was okay. Still no excuse on her part, she was inept to say the least.
As I recall, the subject of the Iraq/Kuwait dispute over the oil fileds came up in her meeting with Saddam, and she said the US would not take an active role or get involved in that issue, so Saddam went ahead with all out invasion to reclaim his '19th province'.