Staying at my Mums for Christmas. Brought presents the other day as all wrapped. Just finished putting everything in her Stocking in the spare room which was AGREED with my Mum that it was to be 'Present HQ' - For context, the house is a Bungalow, so I witnessed this from the kitchen and hit the roof.
So my 3yr Old follows my Mum around like a shadow as she adores her. Fine by me, gives me a bit of a break before I step in and take over.
So my Mum wanders into Present HQ (with my DD next to her) which has a Sofabed with all the presents on including the big polythene Stocking - FULL of presents!!!! My Mum turns away and starts gagging with something and I can see this in corner of my eye from Kitchen and just as I start to dive towards the room, my daughter exclaims "PRESENTS!!!!!! Stocking!!!!" and is sat looking through the stuff in the Stocking and admiring all her presents (wrapped, but still....) My Mum is stood next to her by time I shoot in and saying "Oooh! Isn't that nice!" 

I. HIT. THE. ROOF.
I know that 'she's my daughter and I should've been watching her' but I was prepping veg for tomorrow and my Mum agreed to watch her whilst I did this. The door to the room has a swollen frame and so when shut, really takes quite a push to be opened. We had already spoken about how that would be perfect to hide the presents for this very reason!
AIBU to be not just upset with my Mum but bloody LIVID and feel like Christmas is ruined now? My Mum doesn't seem to see the big deal! I've spent months & Months buying bits towards Christmas as & when I could as I'm Disabled and so money is tight. SO upset


Please be kind (& festive?!) in your responses!