@Emelyn11
Never mind you gave you CB number.
That’s a private agreement between you and your daughter in law (and your bank strongly suggests to never give a CB code to nobody).
Your daughter in law is the tenant.
You did not see the place.
You did not call the host to fix the problem.
The real tenant did not call the host to fix the problem.
You have no right to do a claim.
Only the tenant can.
I doubt you can get anything from a court because you are not the tenant but you, if you like to sue, can try to get your money back from your daughter in law because the CB contract is between you and her.
More seriously, it is your daughter in law to do the job and if she did not contact the host, she cannot claim for a full refund.
Is there an Airbnb email proving she asked the host to clean the place?
There are travellers who send false photos to ask a full refund so it is normal that the guest and host meet to see what is the problem and to fix it.
There is an Airbnb email asking the host to come, sometimes photos. Then another email saying it was fixed or not or any other solution.
Things are clear.
Here you are not the tenant, you saw nothing, you never met the host, you just rely on daughter-in-law speech and true or false photos.
Her speech can be true or exaggerated or false, complete or partial.
Honestly, ask daughter in law to take her responsibilities.
You are not her mother.