Hello Furparents

I would like to ask an advice concerning cat on heat (female). My cat already spayed last year but some how she still exhibit sign of on heat

- kept on calling (meowing non-stop)
- rolling2 on the floor
- licking the private parts
- lift up the body to position

already consult with one of the vet and they can't find whats wrong with her..

is there any alternative? she only started to call out late at night until morning and it quite loud.

recently i did sent to my current vet clinic to check on her, they did operate and confirm there isn't any reproductive organ left

the previous vet clinic sent for operation haven't check on them yet as they just recently re-open after renovation.

i spayed her when she 5 years old although she did had gave birth before when 4 years old (during 1st MCO).
additional note : I did spayed operation when she was still on heat.. not sure if this is the reason.

now already 6 years old