I smell a huge rat here.
I can see her being asked to remove her sticker, but I very seriously doubt that anyone connected to the Republican Party -- much less the Secret Service, "ripped up her ticket".
This story seems like a sob-story plant to portray the Republicans as meanies.
Of course it's a sob story, for the purpose you've mentioned. Note the link from comment #1 - a more violent incident with approximately congruent but reversed circumstances. Do you remember reading about it in your local papers, or on CNN.com, or on the broadcast news?