Renter called to cancel contract

[Sayoni Banerjee]

Brand new townhome, she came to see the property - paid the deposit in cash and signed the contract. Deposit outlined as being non-refundable. She just called (1.5 weeks later) to see if she can get the deposit back because she saw a home in the same area with the same rent but it is a single family home. I did tell her the deposit is non-refundable so if she decides to walk she will lose it. She said she will not break it ( is scheduled to move in early Jan)

As a new landlord, does this happen often? I feel like we are getting off on a wrong footing and worried she might not take are of the unit. Please tell me my fears are unfounded.