@Baigal0 Did she cancel, or simply not show up? If she cancelled, were you able to rebook any of those dates? If so, it would be fair to refund her whatever you earned for another booking for those dates.
If you couldn't rebook the dates, either because she never cancelled, so the dates were blocked oryou couldn't get another booking, then, no, do not refund her anything. You made the policy clear to her, it's her problem, not yours.