Took her to the vet for the forth time for an emmena.Came back from the vet and falls when she walks.

I hope you administered the enema properly; there are other alternatives to making a cat pass stool, and one of them is laxatone, or a tsp. of mineral oil. So many things can go wrong while administering an enema and I have never tried it myself, but quite frankly, have never had a cat with a problem.

Is your cat elderly? I don't see a correlation between your cat being unable to walk and the enema, unless it was done incorrectly. I guess another trip to the vet is necessary, or a call.
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