Fair enough. Well I think it would depend on what you have agreed with the landlady.
For example, if they are holding the property for you, then the landlord will usually be entitled to keep some of the money to cover their costs if you change your mind.
If you are expecting some other outcome, then I would recommend you agree this in writing (so that you have a record of what has been agreed). When I say in writing, over Whatsapp or similar should be fine.