Sibling relationship breaking

Advice/insight is appreciated as I'm having a difficult time with my sister as of late.

I currently live 5 hours away from my family for work. Recently I was back home for a family emergency and was there back and forth for about 3-4 weeks. During the last week I noticed my sister making comments about needing to lose weight and noticing how little she was eating in a day (one day it was around 500 calories) as well as she was making comments like she hadn't had a proper meal in 24 hrs or since X o'clock the previous day. Anytime I've talked about food in the past and how a person needs to eat a certain amount/get enough protein, she shuts it down saying she doesn't. She had a shift a few days before I left and said she went to emerg because she was feeling faint. She got all these tests done that came back normal, and I asked what she ate that day. She said mcdonalds but that didnt tell me much. I didn't respond because I didn't know how to approach the subject without her getting mad because she usually does when I talk about food so I just left it but then she asked later through text if I was okay which seemed weird. All I asked then was if she thought there was any correlation to these faint episodes (because apparently this is happening more as of late) and the amount of food she is eating in a day. She said it has nothing to do with food and she doesn't know why I'm so hung up on it, but I've seen her consume a starvation diet and talk about needing to lose weight when she is bordering on the lower side of a normal BMI, which I didn't say any of this. I didn't respond to her message, again not knowing what to say because I feel like she would get defensive or mad.

She came back with another message telling me all the reasons why it has nothing to do with food and how I should educate myself on her issues (she has GERD/chronic pain) and that she was going to "give me space". We were also supposed to get together with our dad which she canceled and then went on to say "it would have been nice to see you before you left". Yet she was the one who canceled and had a whole day to see me. I didn't bother responding to those messages because the last month had been emotionally difficult, and I felt like I was being baited into some drama. Which isn't the first time something like this has happened. She blew up at me after new years. She said we would hang out one day and then was kind of setting it up like she would have to work and I was like fair because she is so in debt and likely on the very of losing her house as she doesn't have a steady job. Anyway she didn't show, no text, so I assumed she worked. I later found out she made other plans. I didn't ask her about it but then like a week later she texts me asking if I was mad and she didn't know what she did. I said you lied and set it up like you might have to work but you had other plans all along. She blew up and said her life was none of my business and then started bringing up things that had nothing to do with the situation I had an issue with it (lying about hanging out), never owning up to the fact she lied and ended up tearing me down and in the end turned the whole thing around on me saying it was my fault we didn't hang out that day...yet she had other plans??

I don't know, I feel like I'm walking on eggshells lately and I don't know what to do. It seems like it doesn't matter what I say or don't say, there's an issue with it and everything is my fault and she is never in the wrong. I understand she is having a difficult time with her mental and physical health, but it doesn't give permission to treat other people like crap. She has had similar blow outs with friends of hers as well along with not having gotten over a relationship that ended almost 2 years ago, continuing to bring this person up everyday I see her when I am back in town.

I suggested therapy for both of us as her last outburst clearly indicated she has issues with me, or it seems that way, but she wouldn't acknowledge that. I'm not about the drama. I'm tired of walking on eggshells not knowing if something I say is going to set her off. And the thing is, she doesn't act like this with other people. When I see her online all positive and portraying a different personality it makes me sad because I know and see a different side that no one else does for the most part. I had to restrict her on social media back around new years because her messages to me were so mean spirited and triggering, and I've done the same this time around as it felt like it could head in a similar direction. Treatment like this from anyone else honestly I would just block and delete. And maybe I'm in the wrong, I don't know. I suffer from depression/anxiety so this takes a hit as well.