Sit on her.
Seriously...do not let her win the battle. I have three...only one has allowed me to trim his nails from day one without initially fighting me. Ramsey and Reese went WILD. Sometimes it took me 20 minutes to trim nails...but I didn't not relent. Eventually they realized it was going to be done...it could be over in 5 or 20...their choice. After each session I did dole out treats. Now when I trim nails...trust me...when I set one done...they demand that treat.