My DD is 11yo and just started secondary. She has been walking to and from school most days with one girl in particular who lives down the road from us - they didn't know each other before secondary but have become quite close. This girl always appears very confident and DD didn't consider her shy at all. Let's call her Daisy.
There is another girl in DD's class who she has become friends with, let's call her Alice. Alice lives on the way to school - she walks with a large group of friends. Today DD was chatting with Alice and arranged for her and Daisy to walk with the big group tomorrow morning thinking she was doing a good thing by expanding their friendship group. Daisy wasn't present at the time.
DD has called Daisy to let her know and Daisy isn't happy. She says she doesn't feel comfortable walking in a big group. DD has tried to placate her by saying they will just do it this once and see how things go. DD also suggested that she wouldn't leave Daisy's side and that they could walk at the back of the group instead of being very involved in any chats. Daisy isn't budging and doesn't want to walk with this group.
DD doesn't have Alice's number so can't call her to cancel. She is expecting to be met by DD at a pre-arranged meeting spot. If DD doesn't walk with Daisy then she will be walking to school alone and it may harm their friendship. I did suggest that DD meet Alice at the pre-arranged spot in the morning and explain about Daisy, then walk back to meet Daisy. However DD really wants to walk with the big group.
What should she do? To make matters more awkward she has a trip tomorrow and has said she will sit next to Daisy on the bus.
YABU - she should walk with Daisy. As much as their arrangement is reasonably flexible it would be mean to make her walk on her own.
YANBU - DD should be free to make as many friends as she can. She wants to walk with the big group so she should.