am i overreacting (tw sa)

Lowkey wondering what ppl would do in this situation/advice?

Context: My grandma is currently widowed as of 2 years ago. She had two twin daughters and lost them both before I was born. She has been through a lot and I still really love her but I just wonder if some things were off? Also- her twin daughters were victims of csa by her father when they were little which makes me wonder if she is a victim herself? I also think that she has some dementia (not diagnosed) , but she lives in a retirement home in their like independent living area. I just really want some advice.

so I (17f) kind of realized that my grandma sa’d me when I was younger/ there were some weird dynamics. Basically when I was 13 she like took off my swimsuit top and like squeezed & then she told me not to tell my parents bc theyd never let me see her again and that it was just a joke. and also like when I was 7 i had started showering by myself and like i was kind of at a point where I wanted more privacy bc I was “older” and made that known to my family- but I remember one night, I was showering and she unexpectedly came over to our house (i have no idea why or what my parents were doing) but I remember stepping out of the shower to see her there like standing there and smiling saying like “you are just sooo cute!” and I remember being super embarrassed and she told me that she had been outside the shower the whole time. also when I was 15, I would barricade my bedroom door because she’d always swing my door open and I told her to knock (i feel like that was a reasonable request??) but she never did and I was always worried that she’d catch me changing- it almost felt like she was trying too. Another thing is that I remember one night when I was 10, she was playing w my dollhouse set w me and She was like making them swear and be inappropriate. That same night she told me that she loved me more than my other grandma, which was confusing at that age bc I thought that they both loved me the same. Not to mention that she, on multiple occasions, would tell me things like “I just never know how your mom will react to things, she’s unpredictable” etc almost as a way to get me to turn against me? it was weird. Additionally, I remember whenever she like said something she shouldn’t have said (even just like talking bad about my parents), she would say things like “You can’t tell your parents they won’t ever let you come over again” and stuff like that. She also would constantly buy me stuff and give me money randomly and it almost felt like she was trying to win me over. Another weird thing was that i just felt like she was trying to isolate me bc my sister, dad, and grandpa loved science and would always talk about it and she’d always tell me that she was glad I didn’t like science bc then she could “have me all to herself”. I was reminded of all of this bc like we went on vacation to the beach w her this summer and she would always call me gorgeous and constantly compliment my appearance the second I put my swimsuit on rather than like just wearing normal clothes. Also whenever I see her, she always puts her hand on my thigh whenever we sit next to each other and even If I try to like change my body language, she still does it. I’ve always felt like I was her favorite over my older sister and cousin and that she has always been kind of obsessed with me in a way. I genuinely want opinions about this bc it’s kinda making me upset because I can’t tell if i’m just being too hard on her or if this is all a problem.

thanks for the advice!