Hello!
Flystrike is potentially very serious and can eventually lead to toxic shock and even death if left. It's also very painful as the maggots eat through the flesh that is both dead skin or fresh. A fly was probab;y attracted to the wound and hence eggs were laid. It is often so diffcult to remove all the maggots. As there is a hole it is very likely that some may have burrowed further than you are able to see.
All you can do at home is try to remove as many as you can visibly see by picking them out with tweezers and by thoroughly washing the coat to remove any more eggs that have not yet hatched. Long term - your cat does need to be seen and treated by your vet as sometimes a sedation or anaesthethtic is required to flush them all out and to probe for more. Conscious, this is very painful, especially if you say she is already quite difficult to handle.
I'm sorry to say, but at home with no vet intervention you are very limited as to what you can do. The most you can hope for is that you have removed all of the maggots and there are no more eggs in the coat about to hatch shortly. But even if the maggots are all gone, she still has a fair sized hole that will now be very sore.
My only advice is to get veterinary attention as soon as possible. I'm sorry I can't give better news.
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