I wouldn't really muzzle her until you know thats a last resort. What I would try to do first is to get her used to having her nails cut. Unless of course you really feel in danger then of couse muzzle by all means. But by muzzling her right away it *may* make her aggression worse.
Everyday pretend to cut her nails. Start slow though. You only need a few minutes out of each day, if you can do this for about 3-5 minutes at a time and 2-3 times a day it should really help. At first just handle her feet. Then start to fuss with her feet, then get the clippers & put them close to her feet, then pretend to cut her nails. Eventually work your way up.
When she growls, shows her teeth, anything behavior that you do not want, firmly say NO. Praise her when she behaves properly, even if you have to praise right off away, before she has had a chance to growl. keep praising every 10 seconds or so when she is behaving properly.
Good luck.
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