Is she really a friend

So I had this friend for years I been dating her brother for nearly 6 years and we have a nearly 2 year old together anyway we both went to my niece birthday that other moth and she said something that bothered me since but iam over reaching I started self harming at 13 and did so for 7 years stopped when me and her brother become serious and with seeing a counselor she been with me though it all and knows my

Pain anyway when I was at my niece birthday party i picked up some scissor so the kids wouldn't get them and forgot they was in my pocket and I pulled them out and she gose i know you been depressed but you don't need to do that then laughed and said she was joking my question is iam over reaching been upset by this ? What would you do ? Thank you in advance