Vent about my mother..Help am i being mean?

ok so my my moms getting operated because she has cancer i try to help them in any possible way i can because they travel to Houston Texas to the Anderson hospital anyhow ive been paying for their cellphone service for more than 3 years now and her house phone bill she gives me the money to pay it online for her plus the billing adress on that is to my house so she doesnt receive any paper bill so i tell her how much her balance is this month is for and shes like why so much i tell her well theres a call for 3 minutes to Florida where all her family is at.shes like well call and tell them to take it off im like no .so i told her to tell my sister to call and have that fixed i feel like i have to take care of everything and i have 2 other sisters and a brother and me being the youngest i always take care of stuff like that and my sister she never has money and she uses my moms phone and previously i called her phone company and asked them to take off or block all long distance use since the cell phone already includes long distance..shes getting operated soon and i feel like i got my mom mad now i feel guilty but im pregnant and i take care of my bills plus i still have to be responsible enough to remember to pay hers too plus stupid me financed a hummer for my sister that i have to remind her to give me money for her payment plus my baby shower was this past saturday organized by my mother in law and my mom and i still spend a good over 100 bucks ..i would of prefered no baby shower and instead buy everything i wanted for my son..sorry for this long vent just needed it am i being to harsh...