my 1year old is too attached.

my 16month old is TOO ATTACHED. I can't walk away while she is playing, while she is in the tub to lay out her & her sisters (3years old) pjs without her screaming and crying. at night, ever since she was born sleeps w me (I know, bad habbit..) she wakes up looking for me not even an hour after I out her to bed, while im in the living room enjoying some quiet time. I can't do anything wout her. my 3yo doesn't care, she knows im not going any where. Im a stay at home mom and it's gonna change considering im starting college in the next few weeks and I might have to put it on hold because no one can handle her because she wants me 24/7. I still breast feed and im trying to weane her off, I finally got her to sleep through the night, well more now that she doesn't depend on it at night 3months ago (gave her a warm cuppy of milk) but if im not in basically her bed lol she knows. on the 5th me and the hunny are going to a company picnic at kentucky kingdom and my grandma is going to watch them, but now I don't think it's gonna happen. I've tried letting her cry it out and it doesn't work at all. Im going crazy.