Pregnant and best friend stressing me out!

Idk what to do.. my best friend who is like my twin sister is stressing me out really bad.. i used to be engaged to her brother.. we were so in love.. but before we were able to get married he passed away.. and left both of us devastated... weve stayed so close its going to be two years in a few days she got with a guy who is just horrible.. and her brother did not like him at all well she got pregnant last year and i stood by her the entire time i never left her side! Her little one is now 7 months and i have been there for everything well i am now 9 weeks pregnant and when i told her she was so excited and wanted to give me advise.. but ive been very sick i lost 20 pounds that i didnt have to lose had to go to the emergency room and be pumped with fluids.. (she only threw up a couple of times) she kept telling me things like you shouldnt be this sick something is wrong. You cant take zofran that will kill your baby.. theyve done reaserch and ceareal is very bad for your baby if you dont breast feed longer then a year your baby wont be healthy even though her baby is starving becuase she thinks cearal and baby foods are bad for her baby when shes 7 months! Well i was so sick all week my phone was dead and i just let it stay that way because i was to sick to care and after spending 8 hours in the er i finally had checked my facebook where she had called me a bad friend and were not friends anymore to have a nice life i only talked to her because her brother died.. all because i was ignoring her?! I had zero facebook messages from her.. and when i turned my phone on i had zero missed calls and one text message from her the day before! So i messaged her and told her im sorry she felt thay way i wasnt ignoring her ive been to sick to have a phone and spent 8 hours in the hospital yesterday.. i havent even been there for our other best friend who has a brain tumor that there testing on she spent the day in the emergency room the day before i did.. well she didnt respond to the message but deleted the post then today she posted a picture of her in the emergency room getting fluids because her stomach hurts shes spent all day in there and they havent found a thing.. me and our other friend just think she wants attention because we both were in the hospital and now she has to have her turn.. and she posted it on facebook for everyone to pitty her.. nethier me or my friend posted pics of our er trips to facebook i didnt tell anyone but my immediate family and her.. i feel like she only cares about her self and shes not making good choices at all neither of them gave a jobs and she only has her baby a couple nights a week her mother has her the rest of the time and she complains that she cant handle it the second she gets her.. her parents give her money to buy food but they spend it on pot and alcohol.. instead.. she wont get a job her parents do everything for her shes never had to do anything no chores nothing and she gets everything but she thinks her life is so horrible? I dont get it shes 20 years old now.. she lives with her boyfriend and his mom and his brother and his brother baby in a two bedroom appartment.. that they plan on staying there for 5 years so they can save up for an appartment?? Not a house an appartment?! And she complains about bot being able to go out and party all the time so she asked me to get her a job so i did well she turned it down bcuz she cant work on the phones so i helped her with another but theu all have something she doesnt like! I just dont know what to do.. shes stressing me out so much because i love her she is my sister and i can never just walk away! What to do??