When my dog sees me put my black Nike sneakers on, it brings him joy ( walk! )
When he sees me put poop bags in my pocket, it brings him joy ( walk! )
Ditto for collar/leash...
Anything that is usually followed by a pleasant experience, will get a happy association with it.
So if you follow wearing her collar with pleasant experiences, she should soon look forward to putting it in and wearing it...
And another thought is, if you just leave it on long enough, she should just get used to it and even forget she is wearing it (provided it is not too tight, not too heavy, etc)?
She is a cutie!
Rumo ~ rescue shepherd/husky mix