Have you ever made a decision for your child and regret it?

My daughter had her mole shaved today and I’m super sad I can’t stop crying. Her mole had been itchy like crazy and was starting to look like a scab and red all around it ! Dermatologist said it looked abnormal and they will have to do a biopsy to find out what it is...I feel like I don’t deserve to be a mother because I can’t make a right decision...this was her beauty mark and I loved how she looked in her shirts when it showed it off and now I feel it’ll leave a scar I didn’t think it would be that deep ugh.... I hate myself!!! I have no one to talk to... I keep thinking I don’t deserve to be her mom...I’m also currently going through a divorce...and I have horrible short term memory loss... I feel like I don’t deserve to be here I’m just getting so many ugly thoughts of myself ...btw my daughter is in perfect condition. She’s not in pain or anything but the guilt is killing me!!