Its really hilarious that some people think that she's 'stealing'.
When in reality, she isn't. Everyone ranging from Michael Jackson, to Madonna, The Beatles, and other great musical representations have been influenced by people.

Gaga makes everything herself.
Don't you see the interviews where it shows the costume making process?
She has a whole team of people working with her to make her outfits work.

Also..to be honest...the more that people complain about her, the more outrageous and grandiose she becomes. She's doing it on purpose because she's laughing at the fact that you think that she's really going to apply what you think to her artistry.

She's laughing at the people who hate her.
she's also thankful for you, however.
without you + her fans, she wouldn't be possible.