It is all too easy to see and relate to the story of Sarah and Abigail!
Personally I think Sarah became such a insufferable termagant that she was ultimately responsible for her own fall from grace! Abigail was merely in the right place at the right time and had been courted by the Tories who finally regained the reigns of power as Sarah and the Whigs collapsed! Sarah's behaviour toward the Queen was unbelievably disrespectful towards the end. The constant attacks on Marlborough in Parliament and at Court inflamed Sarah's wrath, but ultimately she did nothing to temper her ire and became utterly unbearable! Considering she was actually a rather intelligent woman, Sarah seems to have lost all semblance of politick and craft towards the end.
I think Abigail deserved her own good fortune....as the adage goes "All good things come to those who wait.' She accepted her cousin's help, but boy, did Sarah appear to expect loyalty and prove herself a heavy task master! Considering just how monstrously Sarah behaved it is hardly surprising that Abigail distanced herself and grabbed every morsel of good fortune she could!