Am I wrong?

So I’m living with my parents along with my bf and our son so that we can save money for a house. And we decided to pay my mom to stay home to watch our son. She was only working 20hrs a week and she was always concerned about leaving my grandfather at home alone due to his declining health. This was a win win for all of us. We also agreed to pay half the utilities and I also pay for all the pet supplies (cat litter, and food).

Now more increasingly my mom has been complaining about groceries. And originally I told her to just take my card and buy what she needs. She never listens but continues to complain about the little groceries she buys and spending money. Now that I think about it more and more, I’m starting to get upset because she literally has no bills to pay (maybe some credit card bills idk about) and barely leaves the house but I’m paying her more than what she was paid, she isn’t commuting to work so she’s not spending gas money ( I usually fill up her car when I use it) my father takes care of EVERYTHING else. So am I wrong to be annoyed that she complains about money?