I read into your post that your daughter is a straight A student but I assume her grades have dropped recently?

Maybe the issue boils down to each child has the responsibility to do the best they are capable of (academically, socially, morally, etc) and it is a parent's responsibility to guide and model this for their child. Some ongoing discussion with your daughter seems appropriate, including discussion about her fears of being rejected by her peers. It might be helpful to talk about some times when you were faced with the same issues when you were her age and that you can relate. The love you have for her will underpin all of this.

Try to stay with the current issues and not go too far into the future. That will only increase your anxiety and ultimately, hers.

Best wishes - parenting is not for the faint of heart.