Is it appropriate for my "friend" to ask for the number of a guy I'm seeing? Yes? No? Why?

My friend is known as a huge flirt and alpha female. She has to be the center of attention of all men at all times. She has a history of flirting with any guy I bring around. For example, the other night, she kept squeezing the knee of my date...across my lap. Today, she asked for his number, so she could" give him crap about the frisbee game". Do I give her the number? Is there a point in speaking up? WHAT TO DO? :)