How to fix broken screen of the LG Optimus Showtime?

wife had her lg showtime for 2 weeks put nit in her purse and when she got to work the screen was cracked , do these have defective screens or what. how can i get it fixed ?

The screen on my lg optimus show time is locked up tryed removing battery and every thing else with no results I'm asking from a different phone please help.

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