How to get my roommate out?

Question Details: My roommate was issued a verbal 30 day notice to move out since she does not pay rent and she smokes marijuana. Our landlords are renewing the lease and she will no longer be on the lease as of the first of next month. She is now saying that a verbal notice is not legal. In order to have her move out, do I still need to issue her a written notice? If so, how far in advance? If not, what do I need to do?

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