Taking my cat to the vet?

i think my cat has diarrhea because her stomach is all pink and watery. she doesn't look sad at all. she seems as usual as ever. but my problem is that i hesitate to take her to the vet. i have taken some of my animals to the same vet because they had diarrhea too. if i take her the vet is probably going to think i don't treat my cats right. i take her to the same vet because its the closets and cheapest one. others are cheaper but they are horrible. in order to go to another vet i have to go some where out of my neighborhood. i tell my mom to buy the proper cat food but she doesnt want to . she says yo no "voy a comprar comida para ese gato mugroso!!" im sick of that remark! yesterday i told her i think my cat sick, i also told her that we could buy cat food at the dolar store. she keeps saying the same thing. she doesnt say well you buy it or anything. just the same thing!!!!!!!!!!!!! she is one of those crazy mothers tHAT are hard to talk probems with. i hate her already and im only