Try giving her treats when she's out with you so she'll associate her time with you with good things.
As for her using the bathroom on you, time will most likely cure that. Keep getting her out and handling her, and if she uses the bathroom on you, put her back in her cage. Once she realizes that being with you is fun, she'll want to be out longer... and that will mean holding it.
If you have her out a while of course let her go back to her cage every so often so she can use the bathroom in an appropriate place.
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Kadee Sedtal
"I wish I had a dollar for every time I spent a dollar, because then, yahoo! I'd have all my money back." -Jack Handey