How do I deal with a mean and mocking aunt?

I was excited to go with my mom on a trip to visit her sister. My aunt is close to my mom but lives in another country. She goes back the US every so often. I calculated and I can say I spoke with her at times until I was about 16 years old. I am in my mid 30s and during my late teens early twenties when I wasn't working she wanted me to visit. She wanted me to visit and take care of my grandma who had alzheimers by this time. She also wanted me to care for my aunt who had her own children. It has been about 21 years now since I've seen her or even spoke. Im starting to thank God i didn't come over here for the past 20 something years. I would've loved to see my grandma but she wasn't here mentally anymore. I wouldn't have been able to deal with the verbal abuse. Now I've learned about narcissism and selfish treatment by others. I've been able to survive because i know not to let these things get to me. Even though she embarrassed infront of some cousins my age. It still gets on my nerves. I'm used to being around nice and kind people like my mom or my sister. I'm trying to contain myself until we leave. I've only been here for two days and her whole ordeal is me. She gets on my mom for making sure I'm okay. If I do something not her way she tells me I need to do it her way.

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If I try to talk to her and genuinely want to speak she told me that I'm not a good speaker as her. She's an authoritive and strict aunt. I do feel there is jealousy with my mom and mine relationship. Doesn't have her child in same country.
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I dont want to think that she's being mean to me because she's older and I'm younger. She asked me around the 3rd day of verbally abusing me if I would come back on my own. I feel she wants to come here by myself so I can do stuff for her in her house. I can stay here and do chores and care for her pets. I couldn't believe I'd probably come back but for my mom.
How do I deal with a mean and mocking aunt?
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