Could you explain this sentence…?

Question by chanz: Could you explain this sentence…?
“Besides stripping Goodenow of her winnings, White sentenced Goodenow to a month in jail. But White gave her credit for the six months she served earlier this year for possessing methamphetamine. ”
article from [http://www.kptv.com/news/13864627/detail.html]

I can understand first sentence, but i can’t understand second one.

first. what does “gave her credit for the six months” mean ???

second. Did White give her credit for the six months..because
she served earlier this year for possessing methamphetamine ????

or White gave her credit for the six months when she served earlier this year for possessing methamphetamine

which one is right??? plz help T_T

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