Give your sister the middle finger. If she doesn't care to review your circumstances, then you should not care about hers

From my point of view, watching someone's house and dependants is not a reward. They can take their pets into their vacation and leave the plants at the mercy of God.

If she doesn't care to view you as an adult capable of taking relevant decisions if need be, then she should not burden you with adult responsibilities. She wants to choose her cake and eat it too.