if you really don't need her, then give her one month notice;
not completed 5 years, no need to give long service as I know
she is a good helper, if not you won't use her for nearly 5 years, so why you suddenly don't need her now?
my really good helper has been worked for same employer for 7 years, terminated by former employer suddenly because of the levy problem, she finished one contract with me and just renew contract in Jan 11, 44 years old now, but now she need to go back to phil in one month because of family problem, we are very sad and need to find helper again