My daughter was 22. she had just graduated college in May 2017. We lost her July 10, 2017. It was sensless and heatbreaking. I had never felt like a failure as a parent until that day. She is one of 4 kiddos ranging from 24 to 17. I am still dealing with feelings of being an inadequate parent, but I know it will get better some day.
You are not inadequate as a parent. And she didn't love you or the rest of the family less than you loved her. To her she was setting you guys free from a burden she imagined that she created for you. I can tell you, without any hesitation and absolutely no doubt whatsoever, that it breaks her heart that you feel that way. Don't let her look down from heaven and see that pain. Remember how much she loved you and how much she still loves you. I know it is not easy and I would never attempt to minimize the pain you feel. Just know that that I know, from experience, that her last thought was of you guys and how much she loved you all. I pray you find some of peace in your memories of better times with her.