She's going to do great but I so understand your worry. I know neutering isn't as big a deal as a spay but Sugar wasn't 3 pounds when he was neutered and he had a dental done at the same time (takes longer than extractions) and did he great. I still panic whenever he goes under anesthesia though so I know how you feel. Just log on YT and start a thread about it and we will talk you through it! YT got me through his last dental.
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"If you have men who will exclude any of God’s creatures from the shelter of compassion and pity, you will have men who will deal likewise with their fellow men." — St. Francis of Assisi, 1181-1226