What is the difference between 嘗試，試圖，and 企圖? I'm trying to translate this sentence to Mandarin:


  She's trying to recover the torn photo.


So I was trying to find a meaning of "to try" in Pinpin Dictionary, and I came up with three different words, “嘗試”，“試圖”，and “企圖”. All of them mean "to try". 


Are there any difference between these words?
Based on the context, which one is more appropriate?


  
  她嘗試修復被碎照片。
  她試圖修復被碎照片。
  她企圖修復被碎照片。
嘗試 means simply "to try" or "have tried". For example, 


  "Try something new" => 嘗試新事物


試圖 is synonymous with 打算, and means "planning to do something". It can be translated as "try" or "attempt", but implies more of a plan. For example, 


  "Trying to write a book." => 試圖寫本書.


企圖 has the same meaning with 試圖, but with a negative connotation. For example, 


  "Planning to rob the bank." => 企圖搶銀行


For your case, both 她 嘗試 / 試圖 修復被撕毀的照片 can be acceptable. If she has not yet begun working on the photo, 試圖 sounds most natural. If she's already in the act, I would suggest  正試圖 or 正在嘗試. If she has already finished, go with 嘗試.