We have done this every 6 months since he started getting so many toys. At first, DS was resistant just like your daughter, but we talked about it ahead of time, planned a day, and did it. I had him help as well as he could as a toddler. Sometimes I do sneak in something that I know he was not touched in a very long time, but mostly, he gets input as to what stays and what goes. He ends up feeling good about giving his stuff to "little" kids (he's a big 7 year old now LOL) and helps unload the bags at the Goodwill drop off site. And I know all about tantrums...but this has never caused one. Truthfully, it is my husband who is ridiculous! He wants to check every bag to be sure I am not giving away treasures. Good luck! Nan