This would depend on when the lease actually ended. If it ends at 12:00 midnight tonight, then you would be on the hook for one more day. However, if she has surrendered the premises and terminated the tenancy due to her lease expiring and you have accepted the surrender, then you are under no further obligation to pay for the hotel. Your legal obligation ends when the tenancy does. So since she already surrendered possession, terminated the lease, and accepted the security deposit back, I would opine that you couldn't be held liable for the hotel costs.
When someone returns keys, that is prima facia evidence of terminating the tenancy.
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