hopefully the OP did take out insurance at the time of booking, and even if that insurance won't cover her to travel now, it should hopefully pay out for not being able to travel
@Gogodonu I tried to get insurance with "insurance with" 2 weeks after a lumpectomy, but they wouldn't do it - they said they advised strongly against travel, but if I HAD to, then there were other insurance companies. I don't know who they were, but maybe go back to "insurance with" and ask if they can recommend anyone
We had a short haul holiday a week later than planned, so three weeks post op. That was with "insurance with", although I think they want a longer wait before long haul.
The insurance broker I spoke to told me I would be unlikely to be able to enjoy my holiday much, 2 weeks post op, and it would be better to wait another week anyway.
They were right.
So I would suggest you postpone at least one week, possibly two, and if you took out insurance when you booked, they should cover the cost of postponing, even if they won't cover you for travel now.
If you didn't take out insurance at the time, then you will have to cover the cost of postponing, but hopefully you will still be able to go on your holiday and have a nice time
Good luck