Is there any difference in meaning between the following interrogative sentences and are these both sentences correct?

1: What happened to her?

2: What has happened to her?

In my opinion, both sentences are correct. As far as tenses are concerned, difference lies in that sentence #1 is in simple Past Tense form and other one is in Present Perfect Tense.
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Comments  (Page 3) 
Thanks a lot, AlpheccaStars.

After Mason's arrival, do you say, "What happened to you, Mason?"
HUBLOTAfter Mason's arrival, do you say, "What happened to you, Mason?"
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Thanks a lot for the response, AlpheccaStars.
As far as I have learnt, both of the questions are correct. As jackson has said that the first one is in simple past tense and 2nd one is in present perfect tense.
Very nice explanation. Many times my doubts get cleared by youand I become satisfy. All my best wishes are always with you,god bless you
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The first question can be used in events that happened in the past. As when one is curious about the fate of some character in a story or historical narration, then one would ask : "What happened to her?". The answer could be:
-"She married him and they lived happily ever after."
While in the second question, one can use it to wonder about an event in the near past. So one would ask:
-"What has happened to her?"
The answer could be:
-"She has made an unfortunate accident."
AnonymousShe has made an unfortunate accident.
Note: We have an accident. We don't make an accident. OK? Emotion: smile