My 3.5 year old is having a bit of a hard time with a little mate who's just turned 4. Lots of "you're not my friend" (at said girl's birthday party) and "I don't like you anymore" etc. Which is all fine, honestly (! blub blub) but I'm worried it's starting to affect my girl's confidence, as she's really quite kind and happy and absolutely loves her nursery days but is starting to get a bit wobbly and nervous when this other little one is around. I think this girl seeks her out a bit to give her a hard time. It just makes me sad! Any suggestions...