I offer one to one consultations for people looking to secure ancestral citizenship in Europe so if you'd like to reach out, you can find the sign up link on our IL website. Look for Global Citizen.
Regarding Poland, there is technically no limit on how far back you can go to find an ancestor who qualifies you for residency. The problem is that Poland only came into existence as a modern nation in 1920. That means that your ancestor must either have been alive and Living in Poland when the Polish Republic was declared, or they must have lived on territory that subsequently became the Polish Republic before 1920. For example, many ethnic polls left what was then the Russian Empire or the Austro Hungarian Empire prior to 1920, but qualify as Polish ancestors. Not all countries do that.
If and when you have your Polish citizenship recognized come up your wife would be eligible for a family reunification visa. This is required by European Union law. However, the only way to qualify for it would be to move to a European country as an EU citizen and then apply for her visa once you are settled. She won't be able to get the visa if she's still living abroad.