AITAH for refusing an allowance increase

I am 30 and my partner is in mid 20s. She is a stay at home mum and looks after a 3 year old. We live in London and I cover all the bills, rent etc and with the amount leftover, we divide this between us. The current allocation is 370 a month for myself (personal) and she initially recieved 740 which rose to 780 during a recent payrise. I did not get an increase in my personal. Essentially her 780 includes personal funds, groceries and baby stuff such as clothes etc. The 780 does not include her travel expenses, she has a separate amount for that which was initially 50 but rose recently to 75.
Another side note, I used to get 350, the extra 20 arose as my partner didn’t want to include my snacks in grocery amount so she gave me the extra 20 which I accepted.
We are currently having a disagreement where she feels that her total allocation isn’t enough and that I should give her some of mine because I have money left over to save etc. I completely disagree with this because I feel like I am being punished for being better with money than her whereas her money management isn’t the best. She is quite social and goes out with friends regularly whereas I rarely spend time with friends.
I understand the amount we both recieve requires frugality as London is expensive but I just feel it selfish that she wants me to suffer to appease her, she wants to benefit at my expense. Am I wrong in my thinking?
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