I missed my hair and now it is back but what do i do with it?

Saw my hairdresser today . she’s suggested just keeping eye on length at back ( it may need the odd trim, until the sides and top catch up length wise ) I’ve never had short hair so at this,point I’m hoping to grow it back to usual shoulder length if I can. Hope it doesn’t drive me nuts waiting for it to get there. At the moment I have odd length standing out over my ears . LOL. Least it’s growing