Ok what I would do is get rid of her as she's more hassle then its worth .... But if you can't term her for whatever reasons then I would tell her (and put it in writing for her to sign so she cant say you didnt tell her or she didn't understand) that going forward she needs to give you a months schedule by the 20th of each month for the following month and those days are paid regardless of attendance.... Any extra days will be based on availability and not to accept the shift until you confirm availability (unless someone else will take the child regardless) the extra shifts must be paid for at drop off no exceptions. Them you know when the child is coming and you can refuse an extra day if you so desire.