30-day notice law in california?

I own a condo and gave my roommate a 30-day notice to move out, as the law requires. It appears to me that she is also liable to pay for 30 days of rent whether she moves out earlier or not. Is that right?

Not sure if this next part matters, but she moved in on the 1st a year ago, but I gave her the notice on the 18th. Since 30 days later would be the 18th of the next month, the rent would be prorated for a partial month (she has already paid up to the 30th with last month's check). If she leaves on the 1st is she still liable for the next 18 days of rent money?

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Answers:
A 30-day notice is a pre-eviction tool/notice, to pay rent or quit the lease and vacate the premises. She is liable to pay all past due rent within the stated notice period. If current rent is due in that period as well, then she has to pay it also otherwise, the current rent will be due as prescribed in the lease arrangement.

If rent in arrears is paid w/in the notice period, the 30-day notice has been complied with and you cannot evict for non-payment at that time.

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Not if youre asking her to leave within 30 days - she did you a favor leaving early. She only has to pay for the days she is there. If she left prior to the next months rent being due, then she is off the hook....

Unless she had signed a lease and was breaking the lease, then she isnt required to pay anything above the amount for the days she was present - because you asked her to leave. Had you not asked and she left, then she would be liable for the rent.

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