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我妈有绿卡很多年了， 她 有政府补助的老人公寓和医疗保险，她想回国呆上4个月后， 在回美国， 请问入境时有没有危险。

-Probably it will be fine because CBP does not check the public charge issue, but if USCIS find it and consider it as public charge in the future, you might be fined by US Government and her green card might be trouble at that time.