I'm not sure what to say; I think I'd give the toys back tomorrow (as you didn't actually say you'd take them forever).
I think in that situation I'd have left her for a while so that I could calm down (my nearly 3 yr old ds has a gate across his door that he can't yet open and has a toilet style potty in his room) and then change tack - if the shouting isn't working then neither will shouting longer and louder.
You have to be careful with shouting: the more you do it, the less power it has.
I find, both at home and in the classroom, that the carrot and stick approach works well most of the time - especially if I am consistent with it. To my son I'd say, "Ds, it's time to tidy your toys away," and probably help him do it - perhaps making it into a game by, for example, he picks up all the cars and I'll put away the trucks: who can do it fastest?
If he's uncooperative I'd say, "Ds, when you've tidied up, then you can [insert great treat, sticker or reward here]," and ask him to pass me things or give him a toy to put away - clapping and being happy when he does so.
If he's still not playing ball, then I'll offer the stick: I get down to his level, make him look at me and say, "Ds, I'm going to count to 5. If I get to 5 and you're not tidying up, I'm going to [insert a suitable punishment here; something you can and will do immediately. It doesn't have to be big - start small and work your way up]." He knows I will carry out my threat. I follow this kind of procedure, adapted slightly for different scenarios, every single time.
It's hard when they're laughing at you, but I think that at that age they see it as a big game and the trick is to play along. You give appropriate choices so they feel they have some freedom and autonomy but you set the rules.