Most of the jobs sent overseas are jobs we are not willing to do anymore, at least for what they are worth. That is why we have the illegal immigration problem we have now, they are willing to do the jobs we don't want, or expect to get paid more than what they are worth. My wifes uncle had a great job years ago, he was getting paid $20 an hour to watch an automated lathe turn out cam shafts. This was big money 30 years ago, the Union got greedy and kept striking. Finally the company got fed up with it, and moved overseas. The place where my wife works has openings for 2-LPN nurses, 2 CNA's and 1 housekeeper. They do not have a single application submitted for these jobs. People have gotten used to the "Free" money the government is giving out, that they would prefer to have less money, than to have to work.
Depending on what things are like where your wife works, the LPN positions may get filled with someone that stays for very long, the other positions will have even larger turnover rate of people that accept the position and then leave because they either can't get along with other people, feel they are not paid enough for what they do, or feel they are treated unfairly, or combinations of all this.
If we are talking specialized care, the chances of retaining people goes up, they are generally paid more, and/or are just in a different work environment than people that work in general care areas, the worst usually being nursing homes and similar places.
Just talked to a friend yesterday that was the director of nursing at a nearby nursing home. She said when she had that DON position it was very hard - not one day went by where someone did not call in sick, or some other reason they could not come to work, creating scheduling conflicts and much employee frustrations and resentment of one another. (I think bottom line is they did not want to come to work, not necessarily because they didn't like what they do, they just did not want to put up with what went on there)
She works at a veterans hospital now and says the atmosphere there is completely different, everyone gets along with each other and wants to come to work in general and is just more pleasant place to work. Of course she does get paid more there than the nursing home paid also - and Uncle Sam is essentially her employer. I guess you have to take a job like that while you can, someday Uncle Sam will decide to change things and she may not have a job.