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You cannot put a freeze on her check.
You can tell her that you are moving to one-bedroom apartment and she needs to move out.
You can also get the cooperation of the management to assist you by giving both of you 30-day notice to vacate the premises. You can then vacate and move in to the one-bedroom apartment. If she remains in the apartment after the expiration of the 30-day notice, then the management can file eviction action against her.