Happy Christmas Eve :)
DD needed some warm winter boots so took her to Clarks the other day. She measured 5.5E in both feet so they recommended the only boot they actually do in an E fitting (not sure where she's got her narrow feet from, mine were/are off the scale width-wise
. They seemed to fit fine to my untrained eye. Unfortunately I couldn't buy them then and there due to waiting for a cheque to clear 
We are now in Wales staying with DMIL for Christmas. I happened to pass a shoe shop this morning so picked up a pair of boots without DD being with me. However, the sales assistant told me that I didn't want an E fitting, I wanted an F, and they found that particular style ran small so I should get a 6 rather than a 5.5. Brought them home and they seem ginormous on DD - like wellies
Do I try to return them (bit of a pain as we live a couple of hundred miles away and shop is now closed for a week, but could ask DMIL to do it - is independent shoe shop, not Clark's) or buy her some thick socks for now and wait for her to grow into them? 
TIA :)