Horse won't lunge.. at all?

[Persephone]

I've lunged plenty of times, I've tried many of ways. Even had a professional racehorse trainer work with her, and she's the same with him. She's lunged a few times; what I'd call for her, 'perfectly'. She's just putting up an awful fight or follows me round, no idea as to why. She's only recently started doing this..

Sorry, I'm probably confusing on how I word things. I apologise for that!

I think this is what people are getting a little confused over OP, she knows exactly what she is doing with lunging, but is a confident bolshy youngster who likes to throw her weight around.

She is testing you pure and simple IMO.