Hello :) this is a list contains only characters from the anime because I haven't read the manga so far.
Some character's mind not fit very well into this list, but I think they all have their special strength and abilities. I hope you enjoy voting on this list and feel free to add other strong female Fairy Tail characters.
http://www.ranker.com/list/strongest-female-fairy-tail-mages/owilnic,
Flare Corona
Mavis Vermilion
Mirajane Strauss
Erza Scarlet
Lisanna Strauss
Porlyusica
Ultear Milkovich
Evergreen
Kagura Mikazuchi
Seilah