My answer is a big fat YES! I can definitely see, though, why there would be confusion. This was covert sexual abuse, in my opinion.
First, I don't agree with people who say that sexual abuse only happens when there are sexual intentions. Often covert sexual abusers are completely unaware of their intentions. My mother would be appalled if she knew I identified myself as a sexual abuse survivor and her as my main abuser. She just thought she was being affectionate.
Second, laughing at your discomfort and ignoring your pleas for her to stop are horrifying. Kudos to Annaflower and Apathy123 for drawing attention to this. My mother did this too. I can't describe the feeling of pain and helplessness when you ask someone not to touch you and they laugh at you and keep doing it. You feel like a complete THING.
I'm so glad you had the courage to post this. Please take it seriously.