There is no textual evidence at all to support a spot that high. She is definitely a good fighter, but not even on the level of someone like Bronn or Blackfish
It is made clear that she has an advantage in melee situations simply because the male ego makes people rush her unintelligently. She survives off of males stupidity, not off of prowess
She nearly loses a fight to a chained, beaten, and starved Jaime. (on the show she dominates him, but not in the book).
She nearly dies at the hands of Rorge or Biter (don't remember which one) but is saved by the Brotherhood as she passes out
She aint at the top. She is second tier AT BEST. You have thoroughly disrespected the gawd Barristan Selmy by putting her name so close to his