First, thank you for adopting Nibbs. You will be rewarded a million times over.
Second, if you are having a problem with her nibbling, you might want to make her a kick stick. That way she can get her aggression out, like she does with her towel. You make a long 'log' piece - start with a piece about 12" x 8", seam it along the long edge. Turn it right side out. Stuff it will batting scraps, add some catnip, if she is interested. I usually add a bell for extra stimulation. Close the ends like a candy wrapper - tie the ends shut with a ribbon, leaving fairly long tails.
When she is starting to nibble, exchange her kick stick for your hand/arm. Then love on her after she has worn herself out. She will get the idea that the rough play is only with her towel and her kick stick.
Blues are wonderful intelligent, loving, curious, and total comedians. She will bring you many, many hours of joy and laughter. If you have a place that it will fit, you may want to get her a cat tree (Blues love to be high) and put her a bird feeder outside of a window that has a place for her to lay. Watching the birds will help keep her busy and out of trouble - sometimes
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