One of the largest hurdles for people wanting to live in a Tiny House is access to land. Land is expensive, in growing short supply and people want a balance of having land and being close to city or town centers where they can access services, entertainment and employment.
This page describes the most common path to U.S. citizenship, which allows a green card holder (permanent resident) of at least 5 years to apply for naturalization. Other paths include:
She would have been eligible for citizenship after 3 years if she had been married all 3 of those years. Most people can apply for naturalization 4 years and 9 months after the date on their green card, provided they meet all the requirements.