Lucy has been acting really weird for the past few days. Recently we have covered the top of her cage and found that she likes to spend more time up there, its like her little hang out,so we decided to leave it. But the weird thing is that she recently bit my fiance...twice...which she has not done before. I was witness and she it was bizarre. She climbed up on his shoulder like she wanted to be there and then latched on to his ear big time. Now we are kind of untrusting of her...

He keeps asking me if she could be in heat. She also has a weird behavior with her paper towel tubes....I feel silly even saying this but its almost as if she is humping it!!

I don't know what is going on...any ideas would be much appreciated.

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i think your rite. take the paper towel away because the more she does it to the paper towel, the more her hormonal behavior will increase. has she regurgetated for anyone? also petting her down the back can increase hormonal behavior.
Hormonal Behavior In Parrots
its about cockatiels but there is stuff for parrots in general. when she spends time in here little place with the cover, its a nesting behavior. they like to go under couches, in shoes, shoe boxes etc. as a nesting spot. allowing her to stay in these places can increase her breeding behavior. hope this helped if you have any questions just ask

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TAKE YOUR PETS FOR REGULAR CHECK-UPS!
my cat died at 3 years old due to invasive kideny cancer. he was highly anemic and his kidneys and blood work were off the charts, the vet said it was the worst he's ever seen. we had to put him down that day. up untill then, he showed no sings of illness that we could recognize, however he was a ticking time bomb and only the vet could see it. we thought he was just muscular, but it was just his bulging kideneys. animals hide illness! he only showed signs the day before he died, before this, he seemed completely normal, healthy, and his usual self. his name was maxie and he was my best friend, because we thought he was healthy we didnt take him for check-ups but had we cought it earlier he might have had a chance. we learned from this, we should have paid attention, take ALL your pets for check-ups so they can be helped early on before its too late.
R.I.P maxie (2007-2010)

Birds don't go into heat. But she certainly does sound, well, 'frisky' I suppose we'll call it, lol, and both males and females will hump during these times. And of course, they can and usually do become moody as well.