Why was Rahab hospititality a good thing as to cause her to be saved at the end?

Rehab, believed in God, despite the odds, despite her personal costs. Even though, not considered an upstanding person, she took a stand for goodness, or the right thing...........she was willing to pay that personal price................willingness to obey, despite the odds or the personal cost, is what made her a "great", " an example" or memorable..........