You are of course bound to provide proper financial support as maintenance for your daughter until she reached the age of 18 / adulthood. But you are not obliged to sponsor your ex wife, especially as she has remarried several times and seems highly irresponsible with money.
The daughter should go to a government hospital, where she should receive proper care. Her requestions such widely different sums of money is highly suspicious. And if she had to have an urgent operation, she should have been able to produce a note from her doctor / the surgeon specifying what is wrong, WHAT operation is urgently required, and what it will cost.
The girl is an adult now, and should be able to look after herself, and should have or be seaching for a job. If she has genuine problems, and her mother is apparently useless, she shouldn't use a phone call, but should come and see you and talk about the situation - its far easier for you to assess whether she is genuine and truthful when you can see her and talk with her.
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