I'm going to take her money
You mean steal it? Why?
Because I can. She's got money and she would never let me borrow any.
Taking someone's money without their permission is wrong. If she found out what you did she may never trust you again. Try asking her if you can borrow money instead if you really need it.
What kind of loser would let me borrow their money?
No one if they thought you wouldn't pay it back. If you want people to trust enough to loan you money you should avoid stealing.