Hi everyone, it's me again

Since this new year and I mean the 1st of January to now my relationship with my mother has basically become non-existant but I have no idea why. It started off with her ignoring me when I tried speaking to her regardless of the topic, yet she holds open conversations with my four other siblings and her partner. She then told me that she would not be paying for my bus fare to get to college but she is paying over £1000 for my younger sister to go to New York; I have tried to explain the importance of my college attendence but she doesn't take notice. She has also stopped buying food suitable for my diabetes for my lunch along with refusing to cook my dinner yet she will make meals for my other siblings.
This Tuesday I sat my first A-S level exam, I was hoping for some words of encourgement or for her to ask me how I feel it went but alas she hasn't mentioned it at all which is rather distressing as I have been extremally stressed, losing sleep and my apetite over this exam. I start work today (Thursday) and she hasn't spoken about it. I am the first of all of her children to gain any form of career but this has not been acknowledged.
I apologise if this seems more like a rant but I cannot find reason for her behaviour.
Last November my mother took my phone off me, stating that it would be returned to me this January however when I mentioned to her the possibility of having m phone back she told me that I would now have to wait to February as this was the date she claimed to orignally stated. This aroused confusion with both my siblings and my father whom all understood that January was the original date.
Last week I had to go to hospital to have some blood tests run, instead of asking how it was my mother proceeded to mock me and remind me of my ill health.
She is now avoiding any contact with me including having to be in the same room as I.
I wouldn't mind this behaviour had I upset her but I have done nothing at all.I have tried to ask her why she is isolating me but I always end up in tears as there is so much more on my mind that I am struggling to explain.
I am struggling with simple daily tasks such as taking my medication as I have mentioned in prior posts; I have come to the realisiation that I will have no choice but to explain to my doctor at my next appointment why my blood glucose levels are dangerously high but I will have to do this on my own as my mother has stopped attending my hospital appointments with me.
I don't know what to do anymore, I am so tired of being ignored especially in such a hard time in my life.
Any words of advice would be much obligied.
Many thanks for reading and I hope you are all doing well.
Much love, Jess xx