What friends?

Today as Dolly and I were walking I heard two children shout out Dolly’s name whom she knows well and plays with at nursery.  They ran over to see her, very excited.

I really felt for them as Dolly kept staring at them as though she had never seen them before in her life and despite their efforts to interact they then left looking a little deflated.

This is still toddler behaviour I have yet to understand, “ignoring your friends”.  I may never know the answer.