Advice Needed/ Tenant Move out

[Robert Shadley]

So I'm caught in middle of a sticky situation and it is partially my fault.  Looking for what steps I should take next.

*August 13th a current tenant called to inform me that she got new job across state and that she would not be renewing her lease which ended October 7th.  She says she will be out by the middle of September.  No big deal

*I up the rent by $25, post the property, state that it will be available early October, find a great new tenant, and accept the deposit to hold. Everyone is happy.

*Problem begins-Current tenant is moving into a new build that gets delayed so she doesn't have a place to move things to.  She informs me that she will need until the 15th of October, and she deposits 1/2 months rent into my bank account without my approval to pay for the extra days past her Lease.. This was the at the end of Sept.  I talk to the incoming tenant and she is ok with it being held off a few weeks.  I text the current tenant back let her know she has until the 15th to be moved out.  The problem really cranks up last week when the Incoming tenant finds out that the house she is living (which was in the process of being sold, which is why she is moving) will close on Oct. 11th and she needs to be out that day.  She was told originally she would have 30 days past, which was why she wasn't too concerned.  Now she is out of a place to live, and has no where to put her stuff.

*Problem gets worse now because the current tenant called yesterday and says the new house still isn't done and it could be another week or 2. Now everyone is stressed.  

Now I have definitely learned my lesson.. (Not to promise a move in date to new tenant until old one is out!)

Just not sure what to do from here?  What rights do I have a this point?  Thanks in advance..

p.s. this is in Michigan