She was just excited that she could reject helping him.
She's very vindictive
Bingo. She holds grudges big time and enjoys an opportunity for vindictive payback - made it very clear that it's not about the jacket - Sree ke liye kuch bhi karti - ahh the emphasis yet again on Sree - the basis of her BB life.
And very telling that she doesn't hold a single grudge for her dear brother despite the filth he spoke to and about her multiple times - the way he behaved with her in just the rangoli task should have raised a dozen red flags - but nope 😳