Not all her toys, just the blocks, she still has hundreds of toys.
I'm usually very relaxed about kids making mess and being allowed to play but I have just snapped and taken the blocks away. Now I feel like a mean mum but they don't even play with them, they literally turn the tub over and empty them out then crawl off an do something else. Then they repeatedly travel through the pile spreading them everywhere and getting pissed when they can't push the trucks though them. Then I stand on them and hurt myself.
The blocks were my favourite as a kid as I feel so horrible.
don't make a fuss about taking stuff away, but yes of course reduce to manageable levels. If they are creating, wanting them back then yes give back today but sneak the blocks away tonight.
put stuff away, garage/attic, rotate every few months
see if you feel strong enough (HAHA!) to start a tidy-up regime - if the child/ren want something else out they need to essay tidying up/putting away that which they are playing with currently. This takes time, you need to model tidy-up, encourage them to help yadda yadda.