Yes, that is true. Although I cannot guarantee anything, a person who is outside of the US for less than 12 months should be fine to leave the US and return without issue.
Does it always go this smoothly, no. Sometimes, if the government has reason to believe she abandoned her permanent resident status, they will ask her to show that she never intended to. So long as she keeps property in the US, continues ot pay taxes, remains employed by the US employer, maintains bank accounts, etc., she can show her ties are strong to th US and therefore she has not abandoned her permanent resident status.
Again, this probably won't happen, but if it does, she should be prepared with all of this supporting evidence.
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