A friend of mine was going to buy some land over back taxes owedon it and some way the sale got stopped because she used a quitclaim deed

I don't understand the question. Was she buying the property at a county tax sale or from the owner or what. You need to give more details.

P.S. you should try spell checking so we can understand what you are trying to say.

How do you defeat a quit claim deed?

The only ways to "defeat" a quit claim deed are to either: (1) prove that it was made fraudulently; or (2) find someone who has a better claim of ownership of the property.

Again you need to give more details. A Quit claim deed is used by the property owner to cede his rights to the property. If the deed is valid you can't stop it.

If you want our help you need to explain who is filing the quit claim, to whom is the property being transferred and under what circumstances.

a friend of mine was going to buy some land over back taxes owedon it and some way the sale got stopped because she used a quitclaim deed
Real property TAX sales are not transferred via quit claim deed. The owners who owe the taxes have the RIGHT OF REDEMPTION - usually a year - to pay the taxes and get the land back.

Whoever purchases at a tax sale gets a TAX DEED with the right of redemption outlined in it.