Does schizophrania cause this problem?

my mom has had schizophrania for like the past 6 years and for about 1-2 yrs now shes been very greedy about money i mean she was always a money greedy person even before she got schizo but now its gone bad.. she doesnt buy me and my brother good food thats edible to eat she only buys stuff she knows how to eat and she buys stuff and keeps it in the fridge and cooks it after like a month its been expired and tries to serve it to us.. she also makes us pay for whatever we eat, drink outside the house (mcdonalds, pop) and now shes even making us pay the bills.. she gets money from welfare every month and ive seen her buy alot of purses and shes like "Its my money i can do whatever i want with it" i mean if you arent gonna take care of your own kids why did u have 4 then dammit