All of a sudden a bump popped up above her wrist. today is the second day that it's been there. i think it's a ganglion cyst. how can she rid of it?

Provider is best: Draining the cyst with a needle and syringe at your provider's office is the preferred way. In the past some people have traumatized the cyst by hitting it with a book but that is a rather barbaric treatment in our day and age.

Ganglion cyst: I recommend the "grandmother's treatment" of whacking it with a book. Just place a folded towel over a table edge to give you some padding, flex your wrist over the table edge, and have somone strike the cyst sharply with a solid book. The cyst will rupture. Most ganglions can be treated successfully this way.