my suggestion would be to wrap the tags in tape or something until Keva is about 6 months old or so, when shes stopped "teething".

the other thing is to watch her 100% of the time when shes with Nebo (if you cant watch her then take the quiet spot or nebo's collar off) and as soon as she goes to chew the quiet spot, clap your hands loudly and say "AH!-AH!" to inturrupt her, and then redirect her to an appropriate chew item, one that is similar in material to the quiet spot, so a stuffie or something.

chewing is a drive behavior, and dogs hate to be inturrupted during a drive. its similar to us being engaged in a good book or some engaging behavior- if everytime you sat down to read in the livingroom you were inturrupted, you wouldnt just stop reading, you just wont do it in the livingroom anymore. its the same thing with dogs- if everytime she chews the quiet spot she is inturrupted, she will soon learn that a.) its pointless to chew nebo's quiet spot, so she may as well just chew her toys and b.) when you say "Ah!-Ah!" she can look to you for something good to chew on. It takes a few days of this before they figure it out, but it works, you just have to be consistent.