a mind of own
a mind of your own
the ability to act or think independently I advised her to take the job offer, but she has a mind of her own, so I don't know what she'll decide.
Usage notes: sometimes used humorously of things that are not alive to suggest that they can think or act: My hair seems to have a mind of its own this morning.
a mind of (one's) own
A capacity or inclination to think or act independently: a reporter with a mind of her own.