She will be a retired university professor with independent means. She already owns a home in the US.
Generally you need either an employment or family relationship (or an active investment) to be able to reside in the US. Just coming is as a retired person, property owner or not, does not give someone a right to residency. If this person has the means, she may want to look into investment-based visas. I recommend consulting an attorney about more specific immigration options for her.
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