Consider getting a statement signed by all parties which states that everyone has agreed to terminate the current lease early on X date and all obligations by all parties have been paid in full and that the deposit will be kept by the landlord and will be applied to the new lease. 

I was eager to get one on the board and moved the dates up a week.

Then the prices lower towards the date and you end up booking at a low price or worse just being vacant.I think manually pricing your STR'S is a much better approach.So many people are looking for the next cool software app to buy a subscription to.

@Seidy Lasker Wash sale rules apply to stock options if they are deemed "substantially identical" to a security sold at a loss within 30 days, such as options with similar expiration dates or strike prices.

Got paid 10k at closing. 35 unit mobile home park.

Very in-depth and up to date. 

I was eager to get one on the board and moved the dates up a week.

Very stabilized. 13 unit mobile home park.

Give them notice that their lease will end and you expect them out by a specific date/time.

I would keep the deposit unless I am able to rebook the dates and then I would only make her pay the difference for any unbooked nights.