@Priyanka7
there is one very easy solution for this type of situation - call Airbnb, say you got a THIRD PARTY BOOKING and ask them to cancel this reservation.
Airbnb TOS forbids third-party reservations but Airbnb TOLERATES it if the host agrees to host the third party. In other words - the host is not penalized for accepting it but the reservation will be canceled if the host calls Airbnb and ask for it. In such cases, the host is not penalized for cancellation.
Link to Airbnb TOS
https://www.airbnb.com/terms
make sure to leave an honest review, something like:
" xxx booked for his mother so this was a third party booking which is not allowed by Airbnb TOS. Lady was not a typical Airbnb guest and not familiar with Airbnb concept. She would be better suited in hotel environment. Unfortunately, I can't recommend her to other hosts"