I always think how wonderfully kind and thoughtful people are on this forum,not so much today.Forestgirl you are doing a brilliant job for your GC,making super memories,keep it up--------this time try and sort out outside help then next time go back to your previous arrangement.Your daughter has obviously set her heart on the party maybe she is seeing old friends,or new men etc. at the party,fun she is lacking ?
Remember we all want our own way,maybe she's hormonal,depressed about her future ,lonely for fun ,just acting a bit like a teenager she has probably been really looking forward to this for ages.You sound like a perfect Grandma but we can't do as much as we used to so get tired our children do not see that as Mum as always juggled everything,voice of experience.I have one daughter who has the nack of making the whole family feel bad if she can not do exactly what she planned !
Good luck, maybe get the calendar out and sit down with daughter for future trips after this is all over so no repeat performance----then when your away get the kids to buy her new earrings or something so no bad left over feelings ?