I wouldn't get a diary - I have always been given one by the school! although they are boring I have always decorated them with foam letters (can get in hobby craft!)
def the laminator and paper trimmer - really good when making resources at home so can get them finished at home ready to put up at school! Although I would certainly invest in good quality ones and up to A3!!! As display stuff etc will be bigger than A4
Cheap to run colour printer and coloured paper (amazing how much of your own stuff you use to start with!)
stickers and stampers are great - look at the superstickers website!
lots of frozen meals for the 1st term - she will be shattered and not fancy cooking!
Some of those pens that run out! then can rub out any comments in books that you changed your mind about or where you have written the wrong childs name!! (very easy done when you are tired!)
Does she know what year group she will be teaching as that will make a big difference!
i.e. if foundation of KS1 then will want a teddy (to use for circle time, to go home with a diary for children to write in etc!)
Wish her good luck! and whatever happens in the first few weeks tell her it really will get easier!