Undecided Question

My cat has a skin problem?

okay, so… my cat is losing fur on her belly and we don't know what to do about it… my dad is going to change her diet. we're broke( to all of the mentally retarded people who recommend going to the vet), and we've had her for 3 years. please help!! And it not "bad pet care" to not have money to go to the vet.