Please help me with my Iguanas aggressive behavior?

I took her in because the people that had her couldn't care for her any more (they had her for seven years), they sent me pictures of her and she had like scabs or something all over and she was acting all sick. I took her in and I am feeding her and caring for her just like I feed my other Iguana (I house them separately) and she got almost immediately better. She wouldn't even eat when I got her and now she eat heaping piles of greens and veggies and sometimes fruit (she doesn't care for fruit). Anyhow, She is green and active and looks so much better BUT, She leaps at me with her mouth open even when I am not approaching her. She is free roam (as the owners requested) but this is driving me crazy. She runs at me with her mouth open and hisses and puffs up. Today though I went to get dog food out of the closet and she just about got me, she kept coming at me so I gave her a smack with a pillow. She calmed down and sat under her light. A little later she started up again and there was no way she was backing down this time. She is VERY unpredictable. I have never seen another Iguana like this. What should I do about this, I think she is just challenging me for authority and run of the house. I have dogs and have had to deal with this but reptiles are a little different. She even cuddles with the cat, whats wrong with me? I can't even take her outside and sit with her because she almost bit my ear off last time and there was a LOT of blood. Summer is almost here and I was thinking I could build her a big outdoor thing so she could spend the day outside in the sun, I was thinking it might help her mental well being. Something like this... a href="http://www.parrots.org/index.php?ACT=25&fid=28&aid=66_MrrgY7NU51cylhxi5XNX&thumb=1&board_id=1" rel="nofollow"http://www.parrots.org/index.php?ACT=25&…/a