DD is nearly 13. She's medically complex and has had multiple surgeries the latest of which was a minor surgery last week. DD also has SEND, and even though she's into makeup and music etc, she can sometimes seem a bit younger than her peers socially. DD has never had any issues retaining friends and has a good mix of friends both in mainstream and specialist provision.
As it's DDs birthday soon, my mum kindly offered to pay for her birthday party. Before getting a surgery date, DD initially chose to go to an inflatable park and my mum said there's no limit on friends. However we had to change plans and dates due to DDs surgery recovery. When I asked DD what she wants for her party instead, she asked if we could hire a hall, get an inflatable "disco dome" that has a Bluetooth speaker and lighting and if we could hire a slush machine.
When I told my mum, her reaction was to poo poo this and make comments about how you don't see village hall parties anymore, and how DD is turning 13 so should do something more grown up. Unfortunately this was on the phone and DD overheard. Even though I shut my mum down, DD became upset and decided she no longer wanted a party.
Once she calmed down, DD told us she does still want a party, but she wants to be a kid, and doesn't want to be forced to grow up too quickly.
AIBU to think the type of party DD wants is still totally appropriate for a 13 year old, and pay for it myself so I can ensure DD gets the party she wants?