does she have a bike ? . yes ,she has a bike or yes, she have a bike

We use has after the singular pronouns(he,she,it,any name) whereas have is used next to the plural pronouns(you,we,they) & I .So She has a bike, is right but when raising a question , Does she have a bike, is right.

Does she have a bike? *Yes, she has a bike.

"Yes, she has a bike" is correct.

she l