Here's one you don't see every day.
Domestic servant of State Department employee, for last 7.5 years - 6 of those years overseas.
State Dept. employee forced to return from overseas due to younger child's illness. Younger child passes away.
State Dept. employee decides to stay in U.S. Loss of domestic servant (aka, second mother to employee's older child) would be devastating to older child, particularly after losing younger sibling.
Domestic servant in U.S. legally working on B1-B2 visa with B-1B classification. Domestic servant can stay here for probably another 2.5 years or so extending the visa and work authorization. Employee would like to get her a green card so she can stay indefinitely. Any way an I-485 would be successful in this situation?