Board Thread:Dark Souls II/@comment-26505987-20150617161227/@comment-7736895-20150618173612

http://ca.ign.com/wikis/dark-souls-2/How_to_Beat_Aava,_the_Kings_Pet

http://darksouls2.wiki.fextralife.com/Aava,+the+King%27s+Pet

Well as the first link says she is confirmed to be weak to fire and darktheyre is  tip for close range and long range build on it and one video the second gives more specific build to beat her, more trategy tips and couple videos too but sosme of them are useless, finally I suggest you check this site's page for Aava if you haven't don it already,  In the end the only think I can say to you is, good luck and keep trying every time you die, you get more experience for the next fight