What should i do? Elderly Care?!?

This is for my Aunt. We live together, separate rooms, I am her caretaker and nephew ( basically manage her finances and better health. She is a 75 yr old woman whom has hypertension, multiple stroke history, is a diabetic, and has issues swallowing due to her stokes. She might have possible Aphasia, and is paralyzed from the left. Still could walk a bit with her walker but gets real worked up quickly. Its hard for her to get her daily exercise. Yet she is a strong woman and tries her best. Being human, she has her angry bouts, as any. But it is hard to manage her blood pressure levels when she is aiming her frustrations on you. I am personally having a hard time on this one. She disrespects my company, orders me around like a servant, sometimes compares me to her late husband or makes references about it, when my 4 yr. daughter comes around the weekend, my aunt seems to be upset and jealous. She orders me to do things for my daughter, as she critics my parenting and the same time. Sometimes she gets after and raises her voice to my daughter for not much of a reason. To me shes just upset of her cirstances. I mean i would. She has never had children, and i am the closest the a son to her, i also consider her as my mother as well. I love her as one and i must find a way to go about this without blowing my head off (j/k) lol. No but really i just want to have that peace of mind of doing that right thing. I try to reason, but its just not getting anywhere...she twists my words ina weird way because when i talk to her she aint listening and then she come out like some random stuff like " i know you wouldnt care if i die, you all dont care about me, but i will die soon so i wont be a bother to you all" omg! smh! its frustrating! I must say that my display of anger does not help much, but i just simply cant keep from expessing myself. Iv clearly put her on the spot when i have company so she could know that i will not let her keep doing what she does. so i place a spotlight on her, yet she still does the same. When i have girls, which i must strickly emphasize that are only freinds, she comes in talking all types of disrespect towards them calling them every name in the book and more. The good thing is that she speaks spanich and not much understand her. Nonetheless i explain exactly whats going on so my company wouldn't feel uncomfortable, so far so good, but i shouldn't need to have explanations ready for such occasions. I have to state some relevant facts as well. She don't get much attention or visitation, so in some way i believe that she dislikes my company due to her lack off. Like brother and brother rivalry. I love her nonetheless, i just don't want to say or display a fit of anger that could ultimately affect her health. She is real sensitive, yet has survived. A true blessing she is. I only wish i had the time of day to interact with her as i should, and in not such a negative way. I know she is lonely and being that i live with her she probably wants at least some of my time. But i am always at work! I take her levels in the morning before work and have her prepared meals. She takes her own meds and sometimes eats on her own. She is real stubborn on going to the doctor and telling you if she is feeling sick. She says she is tired of being a burden on us and her/our finances. The Insurance really pays the majority but sometimes my mom blows things out of proportions and my aunt follows wit that misconception. There is alot to say but little space or words for it. I just need some istance, possibly from someone in a similar cirstance or who was in one.