carol
Down with the sickness
OK, perhaps she is over-stimulated with all those toys. I know she only gets 1/3 of those at a time, but even that might be too many at once...making her think that since she has all those toys, everything else in the house is her toys as well.
I was a trainer for a few years until I got tired of the people side of the business. A lot of owners wanted me to just "fix" the dog when it really was the owners LOL.
I would agree with the too many toys. That is a HUGE variety of toys and it makes it very hard for her to figure out what his hers what isn't. I'd limit it to just a few toys and then work on teaching her everything else is off limits. It's easier to teach her that a few special things are OK and everything else isn't, than to try and teach her everything that would not be OK to chew. Then it's your duty not to let her have the run of the house unless you have time to watch her to instruct her what is not chewable.
I'd also teach her a "place" command. For my last dog she had a bed or a blanket in each room that was hers. When on the "place" command, she had to stay there until I gave her a "release" command. Which if I may get side tracked for a moment... a huge problem with a lot of trainers is that they don't teach a "release" command. So if you say "sit" how long is the sit? Same with "down", "heel", or "place". The dog should learn it has to perform the duty until given the "release" command. It makes communication so much more clear.
So when you are busy in the home and can't watch her every second, put her in her "place"... she can sit, stand, or down as long as she is on that bed or blanket and she has to stay there until you say otherwise. (She can even have a chew toy there). I would put her in whatever room you are spending the most time in, and if you move to a different room for an extended period, bring her to the "place" in that room. Of course as a pup you will have to work into extended periods of time just like everything else, slowly add curve balls like leaving the room and reward her with a good exercise/play session after.
I really prefer using "place" instead of a crate whenever possible because it gives the dog something to do mentally. They know they are there because it's their job, not because they are locked in, which most intelligent dogs handle that better than a crate, it also strengthens your training relationship. It's not as easy at the beginning but it pays off. It's a great solid command to have. We had it so well down with our dog that we could even use it outdoors, and if I ever needed to get control without asking for a "come" I could say "place" and she'd find the nearest blanket.
Anyhoo, ya.... I've been missing having a pooch a LOT lately and my feet are too tired to do what I should be doing right now. So there is my book.