You can look at the county public trustee site to see if the property is in foreclosure http://apps.adcogov.org/PTForeclosureSearch/index.aspx.
I did a quick look and did not see that unit listed on the public trustee website (but 747 WEST 96TH AVENUE #3-10 THORNTON, CO 80260 was listed a past foreclosure).
Even if there is no filed foreclosure it is possible there is a distressed sale. You could ask your landlord why she is selling and if the new owners would consider honoring the lease.
Regarding your options, you really would need to talk to an attorney (at your expense or perhaps find free legal resources) and look at the specifics of your situation and lease.
The author make no claims, promises or guarantees about the accuracy, completeness, suitability or adequacy of the information or analysis contained herein. Everything contained herein should be considered a preliminary draft, and potentially flawed personal opinion, which comes without warranties. You are advised consult with legal and tax professions at your own expense before acting.
I am associated with Good Funds Lending, LLC (https://GoodFundsLending.com) a Colorado hard money lender, that does NOT provide owner occupied loans and could not help you to purchase a home to live in, but we wish you the best of luck, whether you stay, find a new property to lease or buy.