Is this normal?

I posted about this a while ago but did not put all the details and, thus, did not get a clear answer.

When I was 12, I went to the Philippines to visit extended family. I stayed at my mom's sister's house, my aunt. One day, I was sleeping and then I woke up to her fondling my butt. I gave her a weird look and she laughed and said she was trying to figure out whether I was wearing padded underwear (that type of thing was really popular in the Philippines because having a big butt was always a standard of beauty when it came to body shapes). She also said she was checking because my butt was "so nice and big".

I didn't think much of it at the time and did not think about again until recently. I took a class on child sexual assault and it reminded me of this incident. I started thinking about whether this would categorize as sexual assault.

I am currently in the Philippines right now and staying at that same aunt's place. I am really uncomfortable around her but try to hide it. Also, today, she pointed out that I had a stain on my butt from my period. Does this mean she was looking at my behind, again?

I don't think she'll touch me again but, like I said, I feel uncomfortable and so far, I have only told my friends. My parents don't know and my mom idolizes this aunt of mine because she paid for my mom's college tuition so even if I tell my mom, she would probably say it's not a big deal. My mom also grabs my privates without my consent as a joke so I don't think she'd take this seriously.

Any advice?