TS is enduring exactly what I used to face. I earn a fair bit more, but I was paying practically everything; car/house loans, house bills, daily expenses. And I hardly spend on leisure or non-essentials. And then she wanted allowance too, after comparing notes with her friends. Argued many times. I refused, not because I'm selfish, but I know for a fact that she will never save anything for rainy days. Even with the MCO, she spends all her money on online shopping.

While I refused to give, I made clear why I did so. With facts. With numbers. I show how much I have saved and invested etc. and how I don't spend on other things. Ultimately she has relented and no longer talks about it. I think TS should share these with for her empathize with you (assuming you don't squander your own earnings).

Alternatively, you can give her 1k-2k monthly as a token. You will have to assume these will be burned.