Kids are often very intuitive. If I had to bet I would lay odds that she knows something is going on with you. If your mom stops showering and caring for her body/hair/face you know something is wrong.
For your daughter’s sake do the basics. Caring for your appearance isn’t vain, it shows the respect you have for yourself and the life you have been graced with
All humans have an innate value but all are very different. Some are conventionally beautiful and some are not. Some are smart and some are not. We all have our flaws and beauties.