Everything about this post is wrong....she never "stunted" on Littlefinger, in fact the deal with the Tyrells was done TOTALLY without her knowledge. She's constantly pawned off by her father. Her taking the throne was perhaps the stupidest thing she could have done, instead of sending Ned to the wall off rip she left it up to her criminally insane son. She rouged up who she "THOUGHT" was Tyrion's whore...meaning she didn't get it right.
Cersei is one of the EASIEST people to fukk with in the series, she is evil has extreme penis envy and couldn't think her way out of a paper bag. Tywin, Tyrion, LF they all know this.